Kernel.xsd

<?xml version="1.0" encoding="utf-8"?>
<schema xmlns:diggs="http://diggsml.org/schema-dev"
    xmlns:diggs_geo="http://diggsml.org/schema-dev/geotechnical"
    xmlns:g3.3="http://www.opengis.net/gml/3.3/ce" xmlns:glr="http://www.opengis.net/gml/3.3/lr"
    xmlns:glrov="http://www.opengis.net/gml/3.3/lrov"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.w3.org/2001/XMLSchema"
    xmlns:xlink="http://www.w3.org/1999/xlink"
    xmlns:eml="http://www.energistics.org/energyml/data/commonv2"
    xmlns:witsml="http://www.energistics.org/energyml/data/witsmlv2"
    xmlns:gml="http://www.opengis.net/gml/3.2"
    xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning"
    targetNamespace="http://diggsml.org/schema-dev" version="dev" elementFormDefault="qualified"
    vc:maxVersion="1.1" vc:minVersion="1.0">
    <!--
 import the gml and xlinks namespaces (original local profiles)   -->
    <!--
  (canonical complete schemas for TeamEngine GML validation) 
  <import namespace="http://www.opengis.net/gml/3.2"
    schemaLocation="http://schemas.opengis.net/gml/3.2.1/gml.xsd"/>
  <import namespace="http://www.opengis.net/gml/3.3/ce"
    schemaLocation="http://schemas.opengis.net/gml/3.3/geometryCompact.xsd"/>
  <import namespace="http://www.opengis.net/gml/3.3/lr"
    schemaLocation="http://schemas.opengis.net/gml/3.3/linearRef.xsd"/>
  <import namespace="http://www.opengis.net/gml/3.3/lrov"
    schemaLocation="http://schemas.opengis.net/gml/3.3/linearRefOffsetVector.xsd"/>
  <import namespace="http://www.w3.org/1999/xlink"
    schemaLocation="http://www.w3.org/XML/2008/06/xlink.xsd"/>
  <import namespace="http://www.w3.org/XML/1998/namespace"
    schemaLocation="http://www.w3.org/2001/xml.xsd"/> 
-->
    <!--  include and import other DIGGS schemas -->
    <!--  import the witsml schemas  -->
    <import namespace="http://www.opengis.net/gml/3.2" schemaLocation="gml3.2Profile_diggs.xsd"/>
    <import namespace="http://www.opengis.net/gml/3.3/lrov" schemaLocation="glrovProfile_diggs.xsd"/>
    <import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="xml.xsd"/>
    <import namespace="http://www.w3.org/1999/xlink" schemaLocation="xlinks.xsd"/>
    <import namespace="http://www.opengis.net/gml/3.3/lr" schemaLocation="glrProfile_diggs.xsd"/>
    <import namespace="http://www.energistics.org/energyml/data/commonv2"
        schemaLocation="energistics/2.0/data/common/v2.1/xsd_schemas/EmlAllObjects.xsd"/>
    <import namespace="http://www.energistics.org/energyml/data/witsmlv2"
        schemaLocation="witsmlv2Profile_diggs.xsd"/>
    <element name="AbstractConstructionActivity" type="diggs:AbstractConstructionActivityType"
        abstract="true" substitutionGroup="diggs:AbstractFeature">
        <!-- 2015-04-10 PwD add substitution gruop -->
        <annotation>
            <documentation>Base type for construction activity features - activities that improve or
                alter ground conditions.</documentation>
        </annotation>
    </element>
    <complexType name="AbstractConstructionActivityPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:AbstractConstructionActivity"/>
        </sequence>
    </complexType>
    <complexType name="AbstractConstructionActivityType" abstract="false">
        <complexContent>
            <extension base="diggs:AbstractFeatureType">
                <sequence>
                    <element ref="diggs:investigationTarget" maxOccurs="unbounded"/>
                    <element ref="diggs:projectRef"/>
                    <element minOccurs="1" ref="diggs:samplingFeatureRef" maxOccurs="1"/>
                    <element minOccurs="0" ref="diggs:programRef" maxOccurs="1"/>
                    <element minOccurs="0" ref="diggs:programSpecificationRef" maxOccurs="1"/>
                    <element name="constructionMethod" type="diggs:SpecificationPropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <documentation>A property element that contains a Specification object
                                (or reference to one) detailing the test procedure method
                                used.</documentation>
                        </annotation>
                    </element>
                    <element name="constructionEnvironment" type="diggs:EnvironmentPropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <documentation>A reference to an Environment object containing
                                environmental properties relevant but external to the construction
                                activity.</documentation>
                        </annotation>
                    </element>
                    <element name="equipment" type="diggs:EquipmentPropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <appinfo>diggs:AbstractEquipment</appinfo>
                            <documentation>A property element that supports a value by reference
                                only. The target value is indicated in the appinfo
                                element.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="otherConstructionActivityProperty"
                        type="diggs:ParameterPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>A reference to a Parameter object used to record
                                properties that otherwise are not included as a property of the
                                construction activity.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="activityDateTime"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>A reference to TimeInterval object identiying the
                                date/time interval over which the entire construction activity was
                                conducted.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractCurve"
        substitutionGroup="diggs:AbstractGeometricPrimitive" type="diggs:AbstractCurveType"/>
    <complexType abstract="true" name="AbstractCurveType">
        <annotation>
            <documentation>diggs:AbstractCurveType is an abstraction of a curve to support the
                different levels of complexity. The curve may always be viewed as a geometric
                primitive, i.e. is continuous.</documentation>
        </annotation>
        <complexContent>
            <extension base="diggs:AbstractGeometricPrimitiveType"/>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractObservationSystem"
        substitutionGroup="diggs:AbstractFeature" type="diggs:AbstractObservationSystemType">
        <annotation>
            <documentation>A system of zones or regions associated with a sampling feature or sample
                for which a single class of qualitative description is assigned (eg. lithology,
                color, discontinuity, etc.)</documentation>
        </annotation>
    </element>
    <complexType abstract="true" name="AbstractObservationSystemType">
        <complexContent>
            <extension base="diggs:AbstractFeatureType">
                <sequence>
                    <element ref="diggs:projectRef"/>
                    <element minOccurs="0" ref="diggs:programRef"/>
                    <choice>
                        <element ref="diggs:samplingFeatureRef"/>
                        <element ref="diggs:sampleRef"/>
                    </choice>
                    <element minOccurs="0" name="observationProcedure"
                        type="diggs:SpecificationPropertyType">
                        <annotation>
                            <documentation>A property containing a Specification object that
                                describes the method used for all of the obserations contained
                                within this ObservationSystem. Where procedures vary among
                                individual observations, use appropriate properties and attributes
                                within the various observation objects to describe the approach
                                used.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="AbstractEquipment" abstract="true" type="diggs:AbstractEquipmentType"
        substitutionGroup="diggs:AbstractFeature">
        <annotation>
            <documentation>The base type for Diggs equipment types. Derivations are objects that
                contains properties of equipment used to construct, test, or monitor objects within
                the geotechnical and geoenvironmental domains. </documentation>
        </annotation>
    </element>
    <complexType name="AbstractEquipmentType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractFeatureType">
                <sequence>
                    <element name="class" type="gml:CodeType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>The class or type of equipment - eg. drill rig, CPT rig,
                                etc. Intended to come from a controlled list. </documentation>
                        </annotation>
                    </element>
                    <element name="make" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>The manufacturer or brand of the
                                equipment</documentation>
                        </annotation>
                    </element>
                    <element name="modelNumber" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>The model name or number of the equipment</documentation>
                        </annotation>
                    </element>
                    <element name="serialNumber" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>The serial number that identifies the unique equipment
                                item.</documentation>
                        </annotation>
                    </element>
                    <element name="calibrationAuditTrail" type="diggs:CalibrationPropertyType"
                        minOccurs="0" maxOccurs="unbounded">
                        <annotation>
                            <documentation>A reference to a Calibration object that stores
                                calibration information for the equipment</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="otherEquipmentProperty"
                        type="diggs:ParameterPropertyType">
                        <annotation>
                            <documentation>Reference to a Parameter object containing the name,
                                value or range of values and unit of measure of a property or a
                                measurement parameter (result).</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractEvent" substitutionGroup="diggs:AbstractObject"
        type="diggs:AbstractEventType">
        <annotation>
            <documentation>The base type for an event - a time or depth related occurrence
                associated with the creation or construction of a sampling feature.</documentation>
        </annotation>
    </element>
    <complexType mixed="false" name="AbstractEventType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" ref="diggs:location">
                        <annotation>
                            <documentation>The measured depth interval over which the event takes
                                place, recorded in the hole's linear referencing
                                system.</documentation>
                        </annotation>
                    </element>
                    <element name="time" type="diggs:TimeIntervalPropertyType" minOccurs="0">
                        <annotation>
                            <documentation>Date/time when this event information was
                                recorded</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="infoRecorded"
                        type="diggs:ParameterPropertyType">
                        <annotation>
                            <documentation><![CDATA[Other associated data measured or observed at this time]]></documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractFeature" substitutionGroup="diggs:AbstractFeatureBase"
        type="diggs:AbstractFeatureType">
        <annotation>
            <documentation>The base type for DIGGS features - extends AbstractFeatureBase by adding
                gml:name, status, remark, internalIdentifer, role and associatedFile
                properties.</documentation>
        </annotation>
    </element>
    <element abstract="true" name="AbstractFeatureBase" substitutionGroup="gml:AbstractFeature"
        type="diggs:AbstractFeatureBaseType">
        <annotation>
            <documentation>Diggs feature base type that serves to restrict gml:AbstractFeatureType
                properties to those used by DIGGS</documentation>
        </annotation>
    </element>
    <complexType name="AbstractFeatureBaseType" mixed="false" abstract="true">
        <complexContent>
            <restriction base="gml:AbstractFeatureType">
                <sequence>
                    <element ref="gml:description" minOccurs="0"/>
                    <element minOccurs="0" ref="gml:identifier"/>
                </sequence>
                <attribute ref="gml:id" use="required">
                    <annotation>
                        <documentation>The id of this feature. The id must be unique within a DIGGS
                            xml instance.</documentation>
                    </annotation>
                </attribute>
                <!-- 2015-04-23 PwD added per http://www.w3.org/TR/xmlschema-1/#d0e2483 Schema Component Constraint: Derivation Valid (Restriction, Complex) 3 -->
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="AbstractFeatureType">
        <complexContent>
            <extension base="diggs:AbstractFeatureBaseType">
                <sequence>
                    <element maxOccurs="unbounded" minOccurs="0" ref="gml:name"/>
                    <element minOccurs="0" name="internalIdentifier"
                        type="gml:CodeWithAuthorityType" maxOccurs="1">
                        <annotation>
                            <documentation>The value of this property is the identifier originally
                                created by the authority for this feature, or that is used as the
                                identifier in the authority's internal data management system -
                                commonly this might be a borehole number or id, job number, or
                                contract number. There is no assumption as to the unique scope or
                                persistence of this identifier. In cases where the original or
                                internal identifier does not meet the semantic requirements for
                                gml:id, the internal identifier may be used in order for the
                                originating authority to "map back" the identifier to an internal
                                data management system. The codeSpace attribute must be populated to
                                identify the authority that uses the internalIdentifier
                                value.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" ref="diggs:status"/>
                    <element minOccurs="0" ref="diggs:implementationStatus">
                        <annotation>
                            <documentation>A text string describing the implementation status of the
                                object or the completion status of the activity. Termes used (usch
                                as in progress, completed, etc.) are intended to come from a
                                controlled list of terms from a dictionary or authority identified
                                in the codeSpace attribute.</documentation>
                        </annotation>
                    </element>
                    <element name="associatedFile" type="diggs:AssociatedFilePropertyType"
                        minOccurs="0" maxOccurs="unbounded">
                        <annotation>
                            <appinfo source="urn:x-gml:targetElement">diggs:AssociatedFile</appinfo>
                            <documentation>A reference to an AssociatedFile object that provides
                                information about external files or documents associated with this
                                feature. The target value is indicated in the appinfo
                                element.</documentation>
                        </annotation>
                    </element>
                    <element name="role" type="diggs:RolePropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>A reference to a Role object that dentifies a specific
                                role or task performed that is associated with this specific
                                feature, the person or organization that performed the role, and
                                associated time frame, if applicable..</documentation>
                        </annotation>
                    </element>
                    <element name="remark" type="diggs:RemarkPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>A reference to a Remark object that provies a comment or
                                remark associated with this specific feature.</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute ref="xml:lang">
                    <annotation>
                        <documentation>Identifies the language used for the values of properties in
                            this feature. Optional; if not used language is assumed to be
                            English.</documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <complexType abstract="true" name="AbstractGeometricAggregateType">
        <complexContent>
            <extension base="diggs:AbstractGeometryType"> </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractGeometricAggregate"
        substitutionGroup="diggs:AbstractGeometry" type="diggs:AbstractGeometricAggregateType">
        <annotation>
            <documentation>Base element for DIGGS geometry aggregates</documentation>
        </annotation>
    </element>
    <complexType abstract="true" name="AbstractGeometricPrimitiveType">
        <annotation>
            <documentation>diggs:AbstractGeometricPrimitiveType is the abstract root type of the
                geometric primitives. A geometric primitive is a geometric object that is not
                decomposed further into other primitives in the system. All primitives are oriented
                in the direction implied by the sequence of their coordinate tuples.</documentation>
        </annotation>
        <complexContent>
            <extension base="diggs:AbstractGeometryType"/>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractGeometricPrimitive"
        substitutionGroup="diggs:AbstractGeometry" type="diggs:AbstractGeometricPrimitiveType">
        <annotation>
            <documentation>Base type for DIGGS geometry primitives </documentation>
        </annotation>
    </element>
    <element abstract="true" name="AbstractGeometry" substitutionGroup="gml:AbstractGeometry"
        type="diggs:AbstractGeometryType">
        <annotation>
            <documentation>Base type for DIGGS geometry objects </documentation>
        </annotation>
    </element>
    <complexType name="AbstractGeometryType">
        <complexContent>
            <restriction base="gml:AbstractGeometryType">
                <sequence>
                    <element ref="gml:description" minOccurs="0"/>
                </sequence>
                <attribute name="srsName" type="anyURI" use="required"/>
                <attribute name="srsDimension" type="positiveInteger" use="required"/>
            </restriction>
        </complexContent>
    </complexType>
    <element name="AbstractGroup" type="diggs:AbstractGroupType"
        substitutionGroup="diggs:AbstractFeature" abstract="true">
        <annotation>
            <documentation>Base type for DIGGS groups - logical associations of projects, sampling
                features, or samples</documentation>
        </annotation>
    </element>
    <complexType name="AbstractGroupType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractFeatureType">
                <sequence/>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractInsituTestProcedure"
        substitutionGroup="diggs:AbstractTestProcedure" type="diggs:AbstractInsituTestProcedureType">
        <annotation>
            <documentation>Base type for all insitu test procedure objects. An in-situ procedure is
                a test procedure where the result is obtained from a location directly on/in the
                feature of interest, via a samplingFeature. Examples include SPT or CPT
                tests.</documentation>
        </annotation>
    </element>
    <complexType abstract="false" name="AbstractInsituTestProcedureType">
        <complexContent>
            <extension base="diggs:AbstractTestProcedureType">
                <sequence>
                    <element minOccurs="0" name="testEvent" type="diggs:InSituTestEventPropertyType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>A test event is a time-based or location-based recording
                                of instantaneous conditions or parameters associated with an in-situ
                                test, such as casing depth, water level, or any custom parameters.
                                This property holds one or more Event objects; Event objects are
                                associated with the type of sampling feature that the in-situ test
                                is performed in. For example, for a standard penetration test
                                performed in a borehole, a BoreholeEvent object would be used in the
                                testEvents property to record the depth to water at various times
                                during the test.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="AbstractLaboratoryTestProcedure" type="diggs:AbstractLaboratoryTestProcedureType"
        substitutionGroup="diggs:AbstractTestProcedure" abstract="true">
        <annotation>
            <documentation>Base type for laboratory test procedure objects. A laboratory test
                procedure is performed on a specimen derived from a sample that was collected from a
                samplingFeature, and therefore the sample's location is known and relates to a
                geographic feature of interest. Use of a laboratory test procedure within a Test
                object does not require that information about the specific sample or specimen is
                known, only that the source location of the sample is known or recorded. This allows
                results of a test to be transferred without specific information about the sample or
                specimen.</documentation>
        </annotation>
    </element>
    <complexType name="AbstractLaboratoryTestProcedureType" abstract="false">
        <complexContent>
            <extension base="diggs:AbstractTestProcedureType">
                <sequence>
                    <element minOccurs="0" name="testEvent"
                        type="diggs:LaboratoryTestEventPropertyType">
                        <annotation>
                            <documentation>An property that contains an object that records an event
                                observed during a laboratory test. This object is a concrete
                                representation of AbstractEvent with no additional
                                properties.</documentation>
                        </annotation>
                    </element>
                    <element name="specimen" type="diggs:SpecimenPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>A property that contains a specialization of
                                AbstractSpecimen that describes the properties for a specimen used
                                in the test procedure. </documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractLinearInstallation"
        substitutionGroup="diggs:AbstractSamplingFeature"
        type="diggs:AbstractLinearInstallationType">
        <annotation>
            <documentation>Base type for installation features with linear geometries. An
                installation is a sampling feature that is installed within another sampling feature
                (eg. a well or piezometer inside of a borehole).</documentation>
        </annotation>
    </element>
    <complexType abstract="false" name="AbstractLinearInstallationType">
        <complexContent>
            <extension base="diggs:AbstractLinearSamplingFeatureType">
                <sequence>
                    <element ref="diggs:samplingFeatureRef"/>
                    <element minOccurs="0" name="installationConstructionEvent"
                        type="diggs:InstallationEventPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on the occurrence and activities involved
                                during construction of the installation within the sampling
                                feature</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="installationEquipment"
                        type="diggs:EquipmentPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractObservation" substitutionGroup="diggs:AbstractObject"
        type="diggs:AbstractObservationType">
        <annotation>
            <documentation>An interval or region defined at a sampling feature that contains
                human-derived, generally category-based observations or
                interpretations.</documentation>
        </annotation>
    </element>
    <complexType abstract="true" name="AbstractObservationType">
        <annotation>
            <documentation>The base type for all descriptions, which extend this
                type</documentation>
        </annotation>
        <complexContent>
            <extension base="diggs:ObjectNoDescriptionType">
                <sequence>
                    <element maxOccurs="unbounded" minOccurs="0" ref="diggs:measurementRef">
                        <annotation>
                            <appinfo>diggs:Test</appinfo>
                            <appinfo>diggs:Monitor</appinfo>
                            <appinfo>diggs:MaterialTest</appinfo>
                            <documentation>If the description derives from a measurement, then this
                                element can be optionally used to point to the subject Test,
                                Materia;Test or Monitor feature via the xlink:href
                                attribute</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" ref="diggs:location">
                        <annotation>
                            <documentation>The location of the description. If not used, observation
                                pertains to the entire sample or sampling feature that is the target
                                of this observation</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="trueTopObserved" type="boolean">
                        <annotation>
                            <documentation>True or false, indicating whether the geometry of the
                                uppermost position of the zone represents the true top of the
                                feature being defined (true) or (false) whether the top represents
                                the upper extent of the zone that is described by the extent of the
                                sampling feature itself.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="trueBaseObserved" type="boolean">
                        <annotation>
                            <documentation>True or false, indicating whether the geometry of the
                                lowermost position of the zone represents the true base of the
                                feature being defined (true) or (false) whether the base represents
                                the lower extent of the zone that is defined by the extent of the
                                sampling feature itself.</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute name="howDetermined" type="diggs:DescriptorMethodEnumType">
                    <annotation>
                        <documentation>A value that describes the method by which the observation or measurement
                            was determined. </documentation>
                    </annotation>
                </attribute>
                <attribute name="stratumCode" type="string">
                    <annotation>
                        <documentation>A legacy attribute to support AGS trial pit sampling features
                            where observations of different stratum may occur at the same depth in a
                            pit. It is a reference letter or number whose sole purpose is to link
                            the stratum shown on a face sketch of the trial pit to the specific
                            observation. </documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractProgram" substitutionGroup="diggs:AbstractFeature"
        type="diggs:AbstractProgramType">
        <annotation>
            <documentation>This feature serves as the head of a substitution group for program
                features that contain properties about the design, specifications, and (optionally)
                post-construction performance results from a collection of construction activities
                that occur within samplingFeatures. While designed to accommodate construction data,
                this property could also contain program objects that include planning and
                specification data for exploration efforts. </documentation>
        </annotation>
    </element>
    <complexType abstract="true" name="AbstractProgramType">
        <annotation>
            <documentation>The base type for all programs, which extend this type</documentation>
        </annotation>
        <complexContent>
            <extension base="diggs:AbstractFeatureType">
                <sequence>
                    <element minOccurs="1" ref="diggs:projectRef">
                        <annotation>
                            <documentation>The location of the description</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="design"
                        type="diggs:AbstractProgramDesignPropertyType"/>
                    <element maxOccurs="unbounded" minOccurs="0" name="specification"
                        type="diggs:AbstractProgramSpecificationPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="AbstractProgramPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:AbstractProgram"/>
        </sequence>
    </complexType>
    <element name="AbstractLinearSamplingFeature" type="diggs:AbstractLinearSamplingFeatureType"
        substitutionGroup="diggs:AbstractSamplingFeature" abstract="true">
        <annotation>
            <documentation>Base type for a sampling feature with a linear geometry (eg. sounding or
                borehole). </documentation>
        </annotation>
    </element>
    <complexType name="AbstractLinearSamplingFeatureType">
        <complexContent>
            <extension base="diggs:AbstractSamplingFeatureType">
                <sequence>
                    <element name="centerLine" type="diggs:LinearExtentPropertyType"
                        maxOccurs="unbounded" minOccurs="1">
                        <annotation>
                            <documentation>A reference to a LinearExtent object that represents the
                                linear geometry of the feature, defining its shape and location. For
                                a borehole for example, the linestring would represent the
                                borehole's trajectory in 3D space. Multiple centerlines can be
                                defined (all associated with the same reference point) to define
                                complex objects such as a wellbore with sidetracks, or different
                                reference datums for a single borehole.</documentation>
                        </annotation>
                    </element>
                    <element name="linearReferencing"
                        type="diggs:LinearSpatialReferenceSystemPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>A reference to a LinearSpatialReferenceSystem object for
                                this sampling feature. A linear SRS allows other objects to
                                reference their position (location) on the sampling feature with 1D
                                coordinates that represents distance along the linear sampling
                                feature, typically from the centerline origin. For sampling features
                                such as boreholes the linear SRS coordinates define measured depths
                                down the hole's centerline.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="plunge" type="diggs:PlungeMeasureType">
                        <annotation>
                            <documentation>For an inclined feature, the plunge angle, measured from
                                the horizontal, positive up</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="bearing" type="diggs:BearingMeasureType">
                        <annotation>
                            <documentation>For an inclined feature, the direction of plunge,
                                positive clockwise from the reference azimuth, as expressed in the
                                refAzimuth attribute.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="AbstractMeasurement" type="diggs:AbstractMeasurementType" abstract="true"
        substitutionGroup="diggs:AbstractFeature">
        <!-- 2015-04-10 PwD add substitution gruop -->
        <annotation>
            <documentation>Base type for measurement features - tests or monitoring activities that
                record quantitative information in the context of a sampling feature or
                sample.</documentation>
        </annotation>
    </element>
    <element name="constructionActivityRef" type="diggs:FeatureReferenceType"/>
    <complexType name="AbstractMeasurementType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractFeatureType">
                <sequence>
                    <element ref="diggs:investigationTarget" maxOccurs="unbounded"/>
                    <element ref="diggs:projectRef"/>
                    <element minOccurs="0" ref="diggs:programRef" maxOccurs="1"/>
                    <choice>
                        <sequence>
                            <element minOccurs="1" ref="diggs:samplingFeatureRef"
                                maxOccurs="unbounded"/>
                            <element maxOccurs="unbounded" minOccurs="0" ref="diggs:sampleRef"/>
                        </sequence>
                        <element maxOccurs="unbounded" minOccurs="1" ref="diggs:sampleRef"/>
                    </choice>
                    <element minOccurs="0" ref="diggs:constructionActivityRef"/>
                    <element minOccurs="0" name="otherMeasurementProperty"
                        type="diggs:ParameterPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>This will typically be used to record environmental
                                parameters, or event-specific parameters that are not tightly bound
                                to either the earth materials for which properties are being
                                estimated, or the procedure. Parameters that are tightly bound to
                                the procedure should be encoded within the procedure
                                object.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractNamedFeature"
        substitutionGroup="diggs:AbstractFeatureBase" type="diggs:AbstractNamedFeatureType">
        <annotation>
            <documentation>The base type for all DIGGS features that require at least one
                name.</documentation>
        </annotation>
    </element>
    <complexType name="AbstractNamedFeatureType" abstract="true">
        <complexContent>
            <restriction base="diggs:AbstractFeatureType">
                <sequence>
                    <sequence>
                        <element minOccurs="0" ref="gml:description"/>
                        <element minOccurs="0" ref="gml:identifier"/>
                    </sequence>
                    <sequence>
                        <element maxOccurs="unbounded" minOccurs="1" ref="gml:name"/>
                        <element minOccurs="0" name="internalIdentifier"
                            type="gml:CodeWithAuthorityType">
                            <annotation>
                                <documentation>The value of this property is the identifier
                                    originally created by the authority for this feature, or that is
                                    used as the identifier in the authority's internal data
                                    management system. There is no assumption as to the unique scope
                                    or persistence of this identifier. In cases where the original
                                    or internal identifier does not meet the semantic requirements
                                    for gml:id or gml:identifier, the internal identifier may be
                                    included in this property in order for the originating authority
                                    to "map back" the identifier to an internal data management
                                    system. The codeSpace attribute must be populated to identify
                                    the authority that uses the internalIdentifier
                                    value.</documentation>
                            </annotation>
                        </element>
                        <element minOccurs="0" ref="diggs:status">
                            <annotation>
                                <documentation>A text string to provide information about the status
                                    of the object to be used to track QA/QC controls, review or
                                    release status, etc. The values used are intended to come from a
                                    controlled list of terms maintained by an
                                    organization.</documentation>
                            </annotation>
                        </element>
                        <element minOccurs="0" ref="diggs:implementationStatus">
                            <annotation>
                                <documentation>A text string describing the implementation status of
                                    the object or the completion status of the activity. Terms used
                                    (such as in progress, completed, etc.) are intended to come from
                                    a controlled list of terms.</documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="unbounded" minOccurs="0" name="associatedFile"
                            type="diggs:AssociatedFilePropertyType">
                            <annotation>
                                <documentation>Identifies external files associated with this
                                    feature. This allows for the feature to be further elaborated
                                    with information that cannot be represented by ASCII text, such
                                    as a photograph or other media, binary data, or a formatted
                                    report.</documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="unbounded" minOccurs="0" name="role"
                            type="diggs:RolePropertyType">
                            <annotation>
                                <documentation>Identifies a specific role or task performed that is
                                    associated with this specific feature, the person or
                                    organization that performed the role, and associated time frame,
                                    if applicable.</documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="unbounded" minOccurs="0" name="remark"
                            type="diggs:RemarkPropertyType">
                            <annotation>
                                <documentation>Any comment or remark associated with this specific
                                    feature.</documentation>
                            </annotation>
                        </element>
                    </sequence>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="AbstractNamedRoleObjectType" abstract="true">
        <complexContent>
            <restriction base="diggs:AbstractFeatureType">
                <sequence>
                    <sequence>
                        <element minOccurs="0" ref="gml:description"/>
                    </sequence>
                    <sequence>
                        <element maxOccurs="unbounded" minOccurs="1" ref="gml:name"/>
                        <element minOccurs="0" ref="diggs:status">
                            <annotation>
                                <documentation>A text string to provide information about the status
                                    of the object to be used to track QA/QC controls, review or
                                    release status, etc. The values used are intended to come from a
                                    controlled list of terms maintained by an
                                    organization.</documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="unbounded" minOccurs="0" name="role"
                            type="diggs:RolePropertyType">
                            <annotation>
                                <documentation>Identifies a specific role or task performed that is
                                    associated with this specific feature, the person or
                                    organization that performed the role, and associated time frame,
                                    if applicable.</documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="unbounded" minOccurs="0" name="remark"
                            type="diggs:RemarkPropertyType">
                            <annotation>
                                <documentation>Any comment or remark associated with this specific
                                    feature.</documentation>
                            </annotation>
                        </element>
                    </sequence>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractNamedRoleObject"
        substitutionGroup="diggs:AbstractFeatureBase" type="diggs:AbstractNamedRoleObjectType">
        <annotation>
            <documentation>The base type for all DIGGS objects that require at least one
                name.</documentation>
        </annotation>
    </element>
    <complexType name="AbstractMeasurementPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:AbstractMeasurement"/>
        </sequence>
    </complexType>
    <element abstract="true" name="AbstractNamedObject" substitutionGroup="diggs:AbstractObjectBase"
        type="diggs:AbstractNamedObjectType">
        <annotation>
            <documentation>The base type for all DIGGS objectx that require at least one
                name.</documentation>
        </annotation>
    </element>
    <complexType name="AbstractNamedObjectType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractObjectBaseType">
                <sequence>
                    <element ref="gml:name" minOccurs="1" maxOccurs="unbounded"/>
                    <element minOccurs="0" ref="diggs:status">
                        <annotation>
                            <documentation>A text string to provide information about the status of
                                the object to be used to track QA/QC controls, review or release
                                status, etc. The values used are intended to come from a controlled
                                list of terms maintained by an organization.</documentation>
                        </annotation>
                    </element>
                    <element name="remark" type="diggs:RemarkPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Any comment or remark associated with this specific
                                object.</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute ref="xml:lang"/>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractObject" substitutionGroup="gml:AbstractGML"
        type="diggs:AbstractObjectType">
        <annotation>
            <documentation>Base type for DIGGS objects - extension of gml:AbstractGML with status
                and remark properties.</documentation>
        </annotation>
    </element>
    <element abstract="true" name="AbstractObjectBase" substitutionGroup="gml:AbstractGML"
        type="diggs:AbstractObjectBaseType">
        <annotation>
            <documentation>Base type for AbstractObject - restricts gml:Object</documentation>
        </annotation>
    </element>
    <complexType name="AbstractObjectBaseType" abstract="true">
        <complexContent>
            <restriction base="gml:AbstractGMLType">
                <sequence>
                    <element ref="gml:description" minOccurs="0"/>
                    <element minOccurs="0" ref="gml:identifier"/>
                </sequence>
                <attribute ref="gml:id" use="required"/>
                <!-- 2015-04-23 PwD added per http://www.w3.org/TR/xmlschema-1/#d0e2483 Schema Component Constraint: Derivation Valid (Restriction, Complex) 3 -->
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="AbstractObjectType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractObjectBaseType">
                <sequence>
                    <element maxOccurs="unbounded" minOccurs="0" ref="gml:name"/>
                    <element minOccurs="0" ref="diggs:status">
                        <annotation>
                            <documentation>A text string to provide information about the status of
                                the object to be used to track QA/QC controls, review or release
                                status, etc. The values used are intended to come from a controlled
                                list of terms maintained by an organization.</documentation>
                        </annotation>
                    </element>
                    <element name="remark" type="diggs:RemarkPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute ref="xml:lang">
                    <annotation>
                        <documentation>Identifies the language used for the values of properties in
                            this feature. Optional; if not used language is assumed to be
                            English.</documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractComponentObject"
        substitutionGroup="diggs:AbstractComponentObjectBase"
        type="diggs:AbstractComponentObjectType">
        <annotation>
            <documentation>Base type for DIGGS componentobjects including name, status, and remarks
                - those objects that are components of other objects and do not require gml:ID for
                referencing.</documentation>
        </annotation>
    </element>
    <element abstract="true" name="AbstractNamedComponentObject"
        substitutionGroup="diggs:AbstractComponentObjectBase"
        type="diggs:AbstractNamedComponentObjectType">
        <annotation>
            <documentation>Base type for DIGGS componentobjects including name, status, and remarks
                - those objects that are components of other objects and do not require gml:ID for
                referencing, but where name is required</documentation>
        </annotation>
    </element>
    <element abstract="true" name="AbstractComponentObjectBase"
        type="diggs:AbstractComponentObjectBaseType">
        <annotation>
            <documentation>Base type for DIGGS componentobjects - those objects that are components
                of other objects and do not require gml:ID for referencing.</documentation>
        </annotation>
    </element>
    <complexType name="AbstractComponentObjectBaseType" abstract="true">
        <sequence/>
        <attribute ref="gml:id" use="optional"/>
    </complexType>
    <complexType name="AbstractComponentObjectType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element ref="gml:description" minOccurs="0"/>
                    <element minOccurs="0" ref="gml:identifier"/>
                    <element maxOccurs="unbounded" minOccurs="0" ref="gml:name"/>
                    <element minOccurs="0" ref="diggs:status">
                        <annotation>
                            <documentation>A text string to provide information about the status of
                                the object to be used to track QA/QC controls, review or release
                                status, etc. The values used are intended to come from a controlled
                                list of terms maintained by an organization.</documentation>
                        </annotation>
                    </element>
                    <element name="remark" type="diggs:RemarkPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute ref="xml:lang">
                    <annotation>
                        <documentation>Identifies the language used for the values of properties in
                            this feature. Optional; if not used language is assumed to be
                            English.</documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="AbstractNamedComponentObjectType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element ref="gml:description" minOccurs="0"/>
                    <element minOccurs="0" ref="gml:identifier"/>
                    <element maxOccurs="unbounded" minOccurs="1" ref="gml:name"/>
                    <element minOccurs="0" ref="diggs:status">
                        <annotation>
                            <documentation>A text string to provide information about the status of
                                the object to be used to track QA/QC controls, review or release
                                status, etc. The values used are intended to come from a controlled
                                list of terms maintained by an organization.</documentation>
                        </annotation>
                    </element>
                    <element name="remark" type="diggs:RemarkPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute ref="xml:lang">
                    <annotation>
                        <documentation>Identifies the language used for the values of properties in
                            this feature. Optional; if not used language is assumed to be
                            English.</documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractPlanarInstallation"
        substitutionGroup="diggs:AbstractSamplingFeature"
        type="diggs:AbstractPlanarInstallationType">
        <annotation>
            <documentation>Base type for installations with planar (2D) geometries. An installation
                is a sampling feature that is installed within another sampling
                feature.</documentation>
        </annotation>
    </element>
    <complexType abstract="false" name="AbstractPlanarInstallationType">
        <complexContent>
            <extension base="diggs:AbstractPlanarSamplingFeatureType">
                <sequence>
                    <element ref="diggs:samplingFeatureRef"/>
                    <element minOccurs="0" name="installationConstructionEvent"
                        type="diggs:InstallationEventPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on the occurrence and activities involved
                                during construction of the installation within the sampling
                                feature</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="installationEquipment"
                        type="diggs:EquipmentPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="AbstractPlanarSamplingFeature" type="diggs:AbstractPlanarSamplingFeatureType"
        substitutionGroup="diggs:AbstractSamplingFeature" abstract="true">
        <annotation>
            <documentation>Base type for sampling features with planar (2D)
                geometries.</documentation>
        </annotation>
    </element>
    <complexType name="AbstractPlanarSamplingFeatureType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractSamplingFeatureType">
                <sequence>
                    <choice>
                        <sequence>
                            <annotation>
                                <documentation>This sequence is used if planarReferencing is not
                                    used and locations within the sampling feature are given as
                                    absolute coordinates.</documentation>
                            </annotation>
                            <element name="featureExtent" type="diggs:AbstractSurfacePropertyType"
                                maxOccurs="1" minOccurs="1">
                                <annotation>
                                    <documentation> This element defines the extent of the surface
                                        feature using a absolute CRS. This element can be used for
                                        visual representations using typical/simple mapping
                                        software. Either this element, or relativeFeatureExtent is
                                        required, and can be optionally added if
                                        relativeFeatureExtent is used. </documentation>
                                </annotation>
                            </element>
                        </sequence>
                        <sequence>
                            <annotation>
                                <documentation>This sequence is used if planarReferencing is used
                                    and locations within the sampling feature are given as relative
                                    coordinates.</documentation>
                            </annotation>
                            <element name="referenceEdge" type="diggs:LinearExtentPropertyType"
                                minOccurs="1" maxOccurs="1">
                                <annotation>
                                    <documentation>A line, whose vertices are described in the same
                                        absolute CRS as the referencePoint, that runs through the
                                        referencePoint along one edge of the sampling feature’s
                                        surface. This element is used and required where
                                        planarReferencing is used, and defines the x-axis of a 2D
                                        relative coordinate reference system.</documentation>
                                </annotation>
                            </element>
                            <choice>
                                <sequence>
                                    <element name="featureExtent"
                                        type="diggs:AbstractSurfacePropertyType" maxOccurs="1"
                                        minOccurs="1">
                                        <annotation>
                                            <documentation> This element defines the extent of the
                                                surface feature using a absolute CRS. This element
                                                can be used for visual representations using
                                                typical/simple mapping software. Either this
                                                element, or relativeFeatureExtent is required, and
                                                can be optionally added if relativeFeatureExtent is
                                                used. </documentation>
                                        </annotation>
                                    </element>
                                    <element name="relativeFeatureBoundary"
                                        type="diggs:AbstractSurfacePropertyType" maxOccurs="1"
                                        minOccurs="0">
                                        <annotation>
                                            <documentation> This element defines the extent of the
                                                surface feature using a relative planar referencing
                                                system (must use planarReferencing property
                                                contents). This element should be used for software
                                                that can handle planar referencing (e.g.
                                                LinearSpatialReferenceSystem in GML 3.3). Either
                                                this element, or featureExtent is required, and can
                                                be optionally added if featureExtent is
                                                used.</documentation>
                                        </annotation>
                                    </element>
                                </sequence>
                                <sequence>
                                    <element name="relativeFeatureBoundary"
                                        type="diggs:AbstractSurfacePropertyType" maxOccurs="1"
                                        minOccurs="1">
                                        <annotation>
                                            <documentation> This element defines the extent of the
                                                surface feature using a relative planar referencing
                                                system (must use planarReferencing property
                                                contents). This element should be used for software
                                                that can handle planar referencing (e.g.
                                                LinearSpatialReferenceSystem in GML 3.3). Either
                                                this element, or featureExtent is required, and can
                                                be optionally added if featureExtent is
                                                used.</documentation>
                                        </annotation>
                                    </element>
                                    <element name="featureExtent"
                                        type="diggs:AbstractSurfacePropertyType" maxOccurs="1"
                                        minOccurs="0">
                                        <annotation>
                                            <documentation> This element defines the extent of the
                                                surface feature using a absolute CRS. This element
                                                can be used for visual representations using
                                                typical/simple mapping software. Either this
                                                element, or relativeFeatureExtent is required, and
                                                can be optionally added if relativeFeatureExtent is
                                                used. </documentation>
                                        </annotation>
                                    </element>
                                </sequence>
                            </choice>
                            <element name="planarReferencing" minOccurs="0" maxOccurs="unbounded"
                                type="diggs:VectorLinearSpatialReferenceSystemPropertyType"/>
                        </sequence>
                    </choice>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractPointInstallation"
        substitutionGroup="diggs:AbstractSamplingFeature" type="diggs:AbstractPointInstallationType">
        <annotation>
            <documentation>Base type for installations with point (0D) geometries. An installation
                is a sampling feature that is installed within another sampling
                feature.</documentation>
        </annotation>
    </element>
    <complexType abstract="false" name="AbstractPointInstallationType">
        <complexContent>
            <extension base="diggs:AbstractPointSamplingFeatureType">
                <sequence>
                    <element ref="diggs:samplingFeatureRef"/>
                    <element minOccurs="0" name="installationConstructionEvent"
                        type="diggs:InstallationEventPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on the occurrence and activities involved
                                during construction of the installation within the sampling
                                feature</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="installationEquipment"
                        type="diggs:EquipmentPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractSample" substitutionGroup="diggs:AbstractNamedFeature"
        type="diggs:AbstractSampleType">
        <annotation>
            <documentation>Base object and Abstract head of a substitution group for all material
                samples. </documentation>
        </annotation>
    </element>
    <complexType name="AbstractSampleType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractNamedFeatureType">
                <sequence>
                    <element name="projectRef" type="diggs:FeatureReferenceType" minOccurs="1">
                        <annotation>
                            <documentation/>
                        </annotation>
                    </element>
                    <element ref="diggs:samplingActivityRef"/>
                    <element ref="diggs:sampleProducedRef">
                        <annotation>
                            <documentation/>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="sampleProducedRef" type="gml:ReferenceType">
        <annotation>
            <documentation>A link to the gml:id of the SampleProduced object contained within the
                associated SamplingActivity feature that is associated with this feature. The
                associated SampleProduced object has as its properties the location and specific
                sampling time for the associated sample.</documentation>
        </annotation>
    </element>
    <element abstract="true" name="AbstractPointSamplingFeature"
        substitutionGroup="diggs:AbstractSamplingFeature"
        type="diggs:AbstractPointSamplingFeatureType"/>
    <complexType name="AbstractPointSamplingFeatureType">
        <complexContent>
            <extension base="diggs:AbstractSamplingFeatureType">
                <sequence> </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="AbstractProcedureTrial" type="diggs:AbstractProcedureTrialType"
        substitutionGroup="diggs:AbstractObject" abstract="true">
        <annotation>
            <documentation>Base type for procedure trial - activities that are repeated as part of a
                test procedure.</documentation>
        </annotation>
    </element>
    <complexType name="AbstractProcedureTrialType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element maxOccurs="unbounded" minOccurs="0" name="otherProperty"
                        type="diggs:ParameterPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractRelativeReferenceSystem"
        type="diggs:AbstractRelativeReferenceSystemType">
        <annotation>
            <documentation>BAse type for linear or vector linear relative spatial reference
                systems.</documentation>
        </annotation>
    </element>
    <complexType name="AbstractRelativeReferenceSystemPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:AbstractRelativeReferenceSystem"/>
        </sequence>
    </complexType>
    <complexType name="AbstractRelativeReferenceSystemType">
        <complexContent>
            <extension base="glr:LinearSRSType"/>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractSamplingFeature"
        substitutionGroup="diggs:AbstractNamedFeature" type="diggs:AbstractSamplingFeatureType">
        <annotation>
            <documentation>An abstract object that serves as the head of a substitution group for
                all sampling features. A sampling feature is a physical object or location through
                which we observe or measure properties of an investigation target, or perform some
                type of activity. It serves to define the dimensionality, extent, and local spatial
                reference system for zones where observations or activities take place.
            </documentation>
        </annotation>
    </element>
    <complexType name="AbstractSamplingFeaturePropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:AbstractSamplingFeature"/>
        </sequence>
    </complexType>
    <complexType name="AbstractSamplingFeatureType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractNamedFeatureType">
                <sequence>
                    <element ref="diggs:investigationTarget" maxOccurs="unbounded" minOccurs="1"/>
                    <element ref="diggs:projectRef"/>
                    <element minOccurs="0" ref="diggs:originalProjectRef"/>
                    <element maxOccurs="unbounded" minOccurs="0" ref="diggs:associatedProjectRef"/>
                    <element minOccurs="0" ref="diggs:programRef"/>
                    <element maxOccurs="unbounded" minOccurs="0" name="environment"
                        type="diggs:EnvironmentPropertyType">
                        <annotation>
                            <documentation>Reference to an object containing environmental
                                parameters recorded during construction of the sampling
                                feature</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="otherSamplingFeatureProperty"
                        type="diggs:ParameterPropertyType">
                        <annotation>
                            <documentation>Reference to an Parameter object containing the name,
                                value or range of values and unit of measure of a property or a
                                measurement parameter.</documentation>
                        </annotation>
                    </element>
                    <element name="locality" type="diggs:LocalityPropertyType" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>A reference to a Locality object, containing
                                non-coordinate location information for a feature.</documentation>
                        </annotation>
                    </element>
                    <element name="referencePoint" type="diggs:PointLocationPropertyType"
                        minOccurs="1">
                        <annotation>
                            <documentation>Reference to a PointLocation object that defines the
                                location of the samplingFeature (usually a location at the ground
                                surface) within a well-known 3D CRS or combined CRS (geographic or
                                projected, and elevation), as an extension of gml:Point object with
                                an additional uncertainty property.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="localCoordinates"
                        type="diggs:LocalCoordinatePropertyType">
                        <annotation>
                            <documentation>A reference to a LocalCoordinate object that holds the
                                values of local coordinates for the reference point of the
                                associated feature. </documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractSpecimen" type="diggs:AbstractSpecimenType">
        <annotation>
            <documentation>AbstractSpecimen serves as the head of a substitution group for concrete
                specimen specializations based on specimen state or type: eg. soil, liquid, gas,
                rock. A specimen derives from one or more Samples, is created as part of a test
                procedure, and exists only in the context of the test procedure that creates
                it.</documentation>
        </annotation>
    </element>
    <complexType abstract="true" name="AbstractSpecimenType">
        <annotation>
            <documentation/>
        </annotation>
        <complexContent>
            <extension base="diggs:AbstractFeatureType">
                <sequence>
                    <element maxOccurs="unbounded" ref="diggs:sampleRef"/>
                    <element minOccurs="0" name="specimenLocation" type="diggs:LocationPropertyType">
                        <annotation>
                            <documentation>In cases where the specimen location may be different from the host sample's location (for example, a specimeen derived from a core sample at a specific location, instead of a specimen encompassing the entire extent of the sample), this property is used to indicate the specific location. When not present, the spcecimen location will be the same as the host sample's location if relevant. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="extractionTime" type="gml:TimePositionType">
                        <annotation>
                            <documentation>The time instant when this specimen was extracted from
                                the sample for testing. This is equivalent to
                                diggs:MaterialTest/sampleTime and diggs:Test/diggs:samplingTime
                                where only one specimen is used for the test and should generally
                                not be used in that case. Where multiple specimens are used for a
                                test and each was extracted from the host at different times, then
                                this property should be used to record the precise sampling time for
                                each specimen.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="preparationProcedure"
                        type="diggs:SpecificationPropertyType">
                        <annotation>
                            <documentation>A property that contains a Specification object or
                                reference to a Specification object that describes the procedure
                                used to prepare the specimen from the sample. This can be a simple
                                description (contained in the Specification object's gml:description
                                property), the name of a standard specification (in the gml:name) or
                                a full procedural specification using appropriate properties in the
                                Specification object. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="otherSpecimenProperty"
                        type="diggs:ParameterPropertyType" maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="AbstractTestProcedure" type="diggs:AbstractTestProcedureType"
        substitutionGroup="diggs:AbstractProcedure" abstract="true">
        <annotation>
            <documentation>Base type for all procedures that comprise a Test or MaterialTest.
            </documentation>
        </annotation>
    </element>
    <complexType name="AbstractTestProcedureType">
        <complexContent>
            <extension base="diggs:AbstractProcedureType">
                <sequence>
                    <element name="testProcedureMethod" type="diggs:SpecificationPropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <documentation>A property element that contains a Specification object
                                (or reference to one) detailing the test procedure method
                                used.</documentation>
                        </annotation>
                    </element>
                    <element name="testProcedureEquipment" type="diggs:EquipmentPropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <appinfo>diggs:AbstractEquipment</appinfo>
                            <documentation>Contains or references an Equipment object. Any concrete
                                object that substitutes for AbstractEquipment can be contained or
                                referenced by this property. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="testingEnvironment"
                        type="diggs:EnvironmentPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Environmental conditions during testing. Values derived
                                at different times during the test can be specified with multiple
                                elements and using the Environment/dateTime
                                property.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="otherTestProperty"
                        type="diggs:ParameterPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="AbstractTimeObject" substitutionGroup="gml:AbstractTimeObject"
        type="diggs:AbstractTimeObjectType">
        <annotation>
            <documentation>Base type for DIGGS time objects</documentation>
        </annotation>
    </element>
    <complexType name="AbstractTimeObjectBaseType">
        <complexContent>
            <restriction base="gml:AbstractTimeObjectType">
                <sequence>
                    <element ref="gml:description" minOccurs="0"/>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>

    <complexType abstract="true" name="AbstractTimeObjectType">
        <complexContent>
            <extension base="diggs:AbstractTimeObjectBaseType">
                <sequence>
                    <element minOccurs="0" ref="diggs:status">
                        <annotation>
                            <documentation>A text string to provide information about the status of
                                the object to be used to track QA/QC controls, review or release
                                status, etc. The values used are intended to come from a controlled
                                list of terms maintained by an organization.</documentation>
                        </annotation>
                    </element>
                    <element name="remark" type="diggs:RemarkPropertyType" minOccurs="0"
                        maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Address" type="diggs:AddressType" substitutionGroup="gml:AbstractGML"
        abstract="false">
        <annotation>
            <documentation>A collection of information used to give the location of a building,
                apartment, or other structure or a plot of land, generally using political
                boundaries.</documentation>
        </annotation>
    </element>
    <complexType name="AddressPropertyType">
        <sequence>
            <element ref="diggs:Address" minOccurs="1" maxOccurs="1">
                <annotation>
                    <documentation>The address object contains properties of a physical address, eg.
                        the location where a person or entity can be reached personally or by mail.</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <complexType name="AddressType">
        <complexContent>
            <extension base="diggs:AbstractObjectBaseType">
                <sequence>
                    <element name="number" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1"/>
                    <element name="streetAddress" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="unbounded"/>
                    <element name="city" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1"/>
                    <element name="state" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1"/>
                    <element name="province" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1"/>
                    <element name="county" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1"/>
                    <element name="country" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1"/>
                    <element name="postalCode" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Advancement" type="diggs:AdvancementType"
        substitutionGroup="diggs:AbstractObject">
        <annotation>
            <documentation>Object that carries drill advancement properties.</documentation>
        </annotation>
    </element>
    <complexType mixed="false" name="AdvancementType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element name="location" type="diggs:LinearExtentPropertyType" minOccurs="1">
                        <annotation>
                            <documentation>The measured depth interval of the reported section of
                                the borehole. </documentation>
                        </annotation>
                    </element>
                    <choice>
                        <element name="time" type="diggs:TimeIntervalPropertyType" minOccurs="0">
                            <annotation>
                                <documentation>Start date/time, end date/time, and duration to
                                    advance the reported section of the borehole.</documentation>
                            </annotation>
                        </element>
                        <element name="elapsedTime" type="eml:TimeMeasure" minOccurs="0">
                            <annotation>
                                <documentation>The amount of time it took to advance over the
                                    reported interval. </documentation>
                            </annotation>
                        </element>
                    </choice>
                    <element name="advancementRate" type="diggs:LengthPerTimeMeasureType"
                        minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>The rate of advancement over the measured depth interval.
                                This property can be used in addition to or in lieu of time or
                                elapsedTime.</documentation>
                        </annotation>
                    </element>
                    <element name="downwardThrust" minOccurs="0" type="eml:ForceMeasure">
                        <annotation>
                            <documentation>Downward thrust on bit</documentation>
                        </annotation>
                    </element>
                    <element name="downthrustPressure" minOccurs="0"
                        type="diggs:pressureMeasureType">
                        <annotation>
                            <documentation>Pressure of downthrust system</documentation>
                        </annotation>
                    </element>
                    <element name="energyDensity" minOccurs="0" type="eml:EnergyPerVolumeMeasure">
                        <annotation>
                            <documentation>Specific energy</documentation>
                        </annotation>
                    </element>
                    <element name="fluidCirculationRate" minOccurs="0"
                        type="eml:VolumePerTimeMeasure">
                        <annotation>
                            <documentation>Fluid (mud) circulation rate</documentation>
                        </annotation>
                    </element>
                    <element name="fluidPressurePump" minOccurs="0" type="diggs:pressureMeasureType">
                        <annotation>
                            <documentation>Fluid (usually mud) pressure at output of
                                pump</documentation>
                        </annotation>
                    </element>
                    <element name="fluidRecoveryRate" minOccurs="0" type="eml:VolumePerTimeMeasure">
                        <annotation>
                            <documentation>Fluid (mud) recovery rate</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="fluidWeight"
                        type="diggs:DensityOrUnitWeightMeasureType">
                        <annotation>
                            <documentation>The mass per unit volume of a drilling fluid, synonymous
                                with fluid density or mud weight. </documentation>
                        </annotation>
                    </element>
                    <element name="hammeringUsed" minOccurs="0" type="boolean">
                        <annotation>
                            <documentation>True if drill stem was hammered while advancing (eg.
                                chiseling).</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="chiselingToolUsed" type="gml:StringOrRefType">
                        <annotation>
                            <documentation>Tool used to perform the chiseling. Intended to come from
                                a controlled list. NOTE: This is a string that could come from a
                                controlled list of terms, but could also reference an Equipment
                                metadata object.</documentation>
                        </annotation>
                    </element>
                    <element name="hammerPressure" minOccurs="0" type="diggs:pressureMeasureType">
                        <annotation>
                            <documentation>Supply pressure to downhole hammer</documentation>
                        </annotation>
                    </element>
                    <element name="mechanicalSpecificEnergy" minOccurs="0"
                        type="eml:EnergyPerVolumeMeasure">
                        <annotation>
                            <documentation>A measure of the energy required to remove a unit volume
                                of rock.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" ref="diggs:penetrationRate">
                        <annotation>
                            <documentation>Rate of advancement of the drill head. Deprecated - use
                                advamcementRate instead</documentation>
                        </annotation>
                    </element>
                    <element name="restrainingForce" minOccurs="0" type="eml:ForceMeasure">
                        <annotation>
                            <documentation>Restraining (holdback) force</documentation>
                        </annotation>
                    </element>
                    <element name="restrainingPressure" minOccurs="0"
                        type="diggs:pressureMeasureType">
                        <annotation>
                            <documentation>Pressure of restraining (holdback) system</documentation>
                        </annotation>
                    </element>
                    <element name="rotationalSpeed" minOccurs="0" type="eml:AngularVelocityMeasure">
                        <annotation>
                            <documentation>Rotational speed of the drill head</documentation>
                        </annotation>
                    </element>
                    <element name="rotationalTorque" minOccurs="0" type="eml:MomentOfForceMeasure">
                        <annotation>
                            <documentation>Rotational torque on the drill head</documentation>
                        </annotation>
                    </element>
                    <element name="torqueOnRods" minOccurs="0" type="eml:MomentOfForceMeasure">
                        <annotation>
                            <documentation>Torque applied to top of drill rods</documentation>
                        </annotation>
                    </element>
                    <element name="torquePressure" minOccurs="0" type="diggs:pressureMeasureType">
                        <annotation>
                            <documentation>Torque pressure</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <simpleType name="AllUnits">
        <annotation>
            <documentation>Enumerated list of all unit abbreviations</documentation>
        </annotation>
        <restriction>
            <simpleType>
                <union
                    memberTypes="diggs:areaPerTimeUom diggs:diggsPressureUom diggs:energyDensityUom diggs:forcePerTimeUom diggs:geotechnicalDensityUom diggs:geotechnicalLengthPerTimeUom diggs:geotechnicalPressureUom diggs:particleSizeUom diggs:percentPerTimeUom diggs:reciprocalSquareRootTimeUom diggs:reciprocalTimeSquaredUom eml:UnitOfMeasureExt"
                />
            </simpleType>
        </restriction>
    </simpleType>
    <complexType name="ReciprocalSquareRootTimeMeasureType">
        <simpleContent>
            <extension base="eml:AbstractMeasure">
                <attribute name="uom" type="diggs:reciprocalSquareRootTimeUom" use="required"/>
            </extension>
        </simpleContent>
    </complexType>
    <simpleType name="reciprocalSquareRootTimeUom">
        <annotation>
            <documentation/>
        </annotation>
        <restriction base="eml:UomEnum">
            <enumeration value="1/m^1/2"/>
        </restriction>
    </simpleType>
    <simpleType name="reciprocalTimeSquaredUom">
        <annotation>
            <documentation/>
        </annotation>
        <restriction base="eml:UomEnum">
            <enumeration value="1/s2"/>
            <enumeration value="Eo"/>
            <enumeration value="mGal/m"/>
            <enumeration value="Gal/m"/>
        </restriction>
    </simpleType>
    <complexType name="ReciprocalTimeSquaredMeasureType">
        <simpleContent>
            <extension base="eml:AbstractMeasure">
                <attribute name="uom" type="diggs:reciprocalTimeSquaredUom" use="required"/>
            </extension>
        </simpleContent>
    </complexType>
    <complexType name="AreaPerTimeMeasureType">
        <simpleContent>
            <extension base="eml:AbstractMeasure">
                <attribute name="uom" type="diggs:areaPerTimeUom" use="required"/>
            </extension>
        </simpleContent>
    </complexType>
    <simpleType name="areaPerTimeUomExt">
        <annotation>
            <documentation>This enumerated list extends eml:AreaPerTimeUom. m2/sec is deprecated.
                m2/s (eml namespace) should be used in its place. mm2/min is deprecated; use mm2/m
                instead to be consistent with eml symbology. 1) cm2/a - squqre centimeter per
                julian-year 2) cm2/d - square centimeter per day 3) cm2/h - square centimeter per
                hour 4) cm2/m - square centimeter per minute 5) m2/a - square meter per julian-year
                6) m2/d - square meter per day 7) m2/h - square meter per hour 8) m2/m - square
                meter per minute 9) m2/sec - square meter per second - deprecated 10) mm2/a - square
                millimeter per julian-year 11) mm2/d - square millimeter per day 12) mm2/h - square
                millimeter per hour 13) mm2/m - square millimeter per minute 13) mm2/min - square
                millmeter per minute - deprecated </documentation>
        </annotation>
        <restriction base="eml:UomEnum">
            <enumeration value="cm2/a">
                <annotation>
                    <documentation>square centimeter per julian-year</documentation>
                </annotation>
            </enumeration>
            <enumeration value="cm2/d">
                <annotation>
                    <documentation>square centimeter per day</documentation>
                </annotation>
            </enumeration>
            <enumeration value="cm2/h">
                <annotation>
                    <documentation>square centimeter per hour</documentation>
                </annotation>
            </enumeration>
            <enumeration value="cm2/m">
                <annotation>
                    <documentation>square centimeter per minute</documentation>
                </annotation>
            </enumeration>
            <enumeration value="m2/a">
                <annotation>
                    <documentation>square meter per julian-year</documentation>
                </annotation>
            </enumeration>
            <enumeration value="m2/d">
                <annotation>
                    <documentation>square meter per day</documentation>
                </annotation>
            </enumeration>
            <enumeration value="m2/h">
                <annotation>
                    <documentation>square meter per hour</documentation>
                </annotation>
            </enumeration>
            <enumeration value="m2/m">
                <annotation>
                    <documentation>square meter per minute</documentation>
                </annotation>
            </enumeration>
            <enumeration value="m2/sec">
                <annotation>
                    <documentation>square meter per second - deprecated</documentation>
                </annotation>
            </enumeration>
            <enumeration value="mm2/a">
                <annotation>
                    <documentation>square millimater per julian-year</documentation>
                </annotation>
            </enumeration>
            <enumeration value="mm2/d">
                <annotation>
                    <documentation>square millimater per day</documentation>
                </annotation>
            </enumeration>
            <enumeration value="mm2/h">
                <annotation>
                    <documentation>square millimater per hour</documentation>
                </annotation>
            </enumeration>
            <enumeration value="mm2/m">
                <annotation>
                    <documentation>square millimater per minute</documentation>
                </annotation>
            </enumeration>
            <enumeration value="mm2/min">
                <annotation>
                    <documentation>square millimater per minute - deprecated</documentation>
                </annotation>
            </enumeration>
        </restriction>
    </simpleType>
    <simpleType name="areaPerTimeUom">
        <union memberTypes="diggs:areaPerTimeUomExt eml:AreaPerTimeUomExt"/>
    </simpleType>
    <element name="AssociatedFile" type="diggs:AssociatedFileType"
        substitutionGroup="diggs:AbstractNamedObject" abstract="false">
        <annotation>
            <documentation>An object that provides information about external files or documents
                associated with the containing features.</documentation>
        </annotation>
    </element>
    <complexType name="AssociatedFilePropertyType">
        <sequence minOccurs="1">
            <element ref="diggs:AssociatedFile" maxOccurs="1" minOccurs="1"> </element>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <complexType name="AssociatedFileType">
        <complexContent>
            <extension base="diggs:AbstractNamedObjectType">
                <sequence>
                    <sequence>
                        <element minOccurs="0" name="contact"
                            type="diggs:BusinessAssociatePropertyType" maxOccurs="unbounded">
                            <annotation>
                                <documentation>The person or business to contact about this file.
                                    This property should be populated where a fileURL is not
                                    provided.</documentation>
                            </annotation>
                        </element>
                        <element minOccurs="1" name="fileURL" type="anyURI">
                            <annotation>
                                <documentation>Path to the digital file</documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="1" minOccurs="0" name="fileType" type="gml:CodeType">
                            <annotation>
                                <documentation>Digital file type, typically denoted by the file
                                    extension (eg. .jpg, .pdf)</documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="1" minOccurs="0" name="creatingApplication"
                            type="diggs:SoftwareApplicationPropertyType">
                            <annotation>
                                <documentation>Name of the application that created the file, where
                                    applicable.</documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="1" minOccurs="0" name="documentType" type="gml:CodeType">
                            <annotation>
                                <documentation>For documents, the type of document that the file
                                    represents, such as photo, report, log, etc.). </documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="1" minOccurs="0" name="fileDate"
                            type="gml:TimePositionType">
                            <annotation>
                                <documentation>Date file created or last modified.</documentation>
                            </annotation>
                        </element>
                        <element minOccurs="0" ref="diggs:fileStructure"/>
                        <element minOccurs="0" name="mimeType" type="diggs:mimeTypeEnumExtType">
                            <annotation>
                                <documentation>The mime type of the file, from an enumerated list. Non-registered mime types should be entered as Other: type/subtype where the subtype
                                    should begin with "x-", eg.
                                    application/x-segy.</documentation>
                            </annotation>
                        </element>
                        <element minOccurs="0" name="compression" type="anyURI">
                            <annotation>
                                <documentation>A value that identifies the compression algorithm
                                    used, if applicable (eg LZW).</documentation>
                            </annotation>
                        </element>
                        <element minOccurs="0" name="encryption" type="anyURI">
                            <annotation>
                                <documentation>A value that identifies the file encryption algorithm
                                    used, if applicable (eg. AES).</documentation>
                            </annotation>
                        </element>
                    </sequence>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="associatedProjectRef" type="diggs:FeatureReferenceType">
        <annotation>
            <appinfo source="urn:x-gml:targetElement">Diggs:Project</appinfo>
            <documentation>A reference to a project that uses the feature within its business
                activity. The associated project is not intended to be the one that established the
                feature in the first place. The property originalProjectRef should be used for that
                purpose. </documentation>
            <documentation>A property element that supports a value by reference only. The target
                value is indicated in the appinfo element.</documentation>
        </annotation>
    </element>
    <element name="Backfill" substitutionGroup="diggs:AbstractObject" type="diggs:BackfillType">
        <annotation>
            <documentation>An object that contains properites associated with backfilling of a
                borehole. </documentation>
        </annotation>
    </element>
    <element name="BackfillLayer" substitutionGroup="diggs:AbstractObject"
        type="diggs:BackfillLayerType">
        <annotation>
            <documentation>An object that carries properties for a layer of backfill
                material.</documentation>
        </annotation>
    </element>
    <complexType name="BackfillLayerPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:BackfillLayer"/>
        </sequence>
    </complexType>
    <complexType name="BackfillLayerType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="backfillInterval"
                        type="diggs:LinearExtentPropertyType">
                        <annotation>
                            <documentation>The depth interval in the borehole (measured in a linear
                                reference system), where the backfill material was emplaced. If
                                omitted, it is assumed that the backfill information pertains to the
                                entire length of the hole</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="whenEmplaced" type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>Indicates the date/time during which the backfill was
                                emplaced in this depth interval.</documentation>
                        </annotation>
                    </element>
                    <element name="backfillMaterial" type="gml:CodeType">
                        <annotation>
                            <documentation>The type of material used as backfill (eg. bentonite,
                                cuttings, sand, etc.). Intended to come from a controlled list
                                assigned to an authority.</documentation>
                        </annotation>
                    </element>
                    <element name="isSanitarySeal" type="boolean" minOccurs="0">
                        <annotation>
                            <documentation>If true, identifies this backfill layer as a sanitary
                                seal.</documentation>
                        </annotation>
                    </element>
                    <element name="backfillVolume" type="eml:VolumeMeasure" minOccurs="0">
                        <annotation>
                            <documentation>The total valume of backfill material emplaced in this
                                layer</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="groutingActivityRef"
                        type="diggs:FeatureReferenceType">
                        <annotation>
                            <appinfo>diggs:GroutingActivity</appinfo>
                            <documentation>If pressure and flow rate time series are recorded for
                                this backfill layer, this information is stored in a grouting
                                activity feature. This property points to the grouting activity
                                corresponding to emplacement of this layer</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="groutRef" type="diggs:FeatureReferenceType">
                        <annotation>
                            <appinfo>diggs:GroutBatch</appinfo>
                            <documentation>If information is recorded about components of a Grout
                                used for backfill or as part of a grouting activity,this property
                                points to the GroutBatch object corresponding to the grout batch
                                used in this backfill layer.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="wellOpeningRef" type="diggs:FeatureReferenceType">
                        <annotation>
                            <appinfo>diggs:GroutBatch</appinfo>
                            <documentation>If information is recorded about components of a Grout
                                used for backfill or as part of a grouting activity,this property
                                points to the GroutBatch object corresponding to the grout batch
                                used in this backfill layer.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="BackfillPropertyType">
        <sequence>
            <element minOccurs="1" ref="diggs:Backfill"/>
        </sequence>
    </complexType>
    <complexType name="BackfillType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="backfillDateTime"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The date/time interval over which the entire backfilling
                                operation was conducted. Date/time intervals can also be specified
                                for the emplacement of individual backfill layers in the
                                backfillLayers property.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="backfillLayer"
                        type="diggs:BackfillLayerPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>The depth intervals where backfill is emplaced. The
                                backfill intervals should not overlap, nor should there be gaps
                                between intervals.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="backfillType" type="diggs:backfillTypeEnumType">
                        <annotation>
                            <documentation>A controlled list of terms to indicate what type of
                                backfilling is described in the object. Choices are: annular space
                                within borehole - backfilling occurs within the annular space
                                between the outer casing and the natural borehole wall annular space
                                between casings - backfilling occurs within the annular space
                                between nested casings open hole - backfilling occurs within an open
                                hole within casing - backfilling occurs within the innermost
                                casing</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <simpleType name="backfillTypeEnumType">
        <restriction base="string">
            <enumeration value="annular space within borehole"/>
            <enumeration value="annular space within casings"/>
            <enumeration value="open hole"/>
            <enumeration value="within casing"/>
        </restriction>
    </simpleType>
    <complexType name="BearingMeasureType">
        <simpleContent>
            <extension base="diggs:BearingMeasureBaseType">
                <attribute name="refAzimuth" type="witsml:AziRef"/>
            </extension>
        </simpleContent>
    </complexType>
    <element abstract="false" name="Borehole"
        substitutionGroup="diggs:AbstractLinearSamplingFeature" type="diggs:BoreholeType">
        <annotation>
            <documentation>A sampling feature feature that is a deep, narrow excavation made by
                drilling and/or extraction of earth material. Boreholes are constructed typically
                for the purpose of investigating subsurface geologic or geotechnical conditions,
                exploring for water or oil, for installation of wells or other downhole monitoring
                installations.</documentation>
        </annotation>
    </element>
    <element name="BoreholeConstructionMethod" type="diggs:BoreholeConstructionMethodType">
        <annotation>
            <documentation>An object that contains properties of borehole
                construction.</documentation>
        </annotation>
    </element>
    <complexType name="BoreholeConstructionMethodPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:BoreholeConstructionMethod"/>
        </sequence>
    </complexType>
    <complexType name="BoreholeConstructionMethodType">
        <complexContent>
            <extension base="diggs:AbstractNamedRoleObjectType">
                <sequence>
                    <element minOccurs="0" ref="diggs:location">
                        <annotation>
                            <documentation>The location within the sampling feature that corresponds
                                to the particular construction method being referenced here. If
                                omitted, it is assumed that the procedures specified apply to the
                                entire extent of the sampling feature</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="methodTime"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The period of time during which the construction event is
                                occurring</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="holeStability" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>Uncontrolled string describing stability conditions of
                                the hole during this interval</documentation>
                        </annotation>
                    </element>
                    <element name="constructionMethod" type="diggs:SpecificationPropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <documentation>Contains a Specification object that may be used to describe any details regarding the method of construction. It should not be used to simply provide a name for the construction method. That value should be entered in the gml:name property for this object.</documentation>
                        </annotation>
                    </element>
                    <element name="constructionEquipment" type="diggs:EquipmentPropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <documentation>A property element that contains an Equipment feature (or
                                reference to one) that details the construction equipment
                                used.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="cuttingToolInfo"
                        type="diggs:CuttingToolArrayPropertyType"/>
                    <element minOccurs="0" name="drillPipeInfo"
                        type="diggs:DrillPipeArrayPropertyType"/>
                    <element minOccurs="0" name="hydraulicFluidFlowRate"
                        type="eml:VolumePerTimeMeasureExt">
                        <annotation>
                            <documentation>The flow rate of the hydraulic fluid.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="BoreholeDiameter" substitutionGroup="diggs:AbstractObject"
        type="diggs:BoreholeDiameterType">
        <annotation>
            <documentation>An object that carries the diameter of a borehole and its
                location.</documentation>
        </annotation>
    </element>
    <complexType name="BoreholeDiameterPropertyType">
        <sequence>
            <element ref="diggs:BoreholeDiameter" maxOccurs="1"/>
        </sequence>
    </complexType>
    <complexType name="BoreholeDiameterType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element name="diameterLocation" type="diggs:LinearExtentPropertyType"
                        maxOccurs="1" minOccurs="0">
                        <annotation>
                            <documentation>The depth interval in the hole that pertains to the
                                diameter reported, measured in a linear referencing system. If
                                omitted, it is assumed that the diameter reported pertains to the
                                entire length of the hole</documentation>
                        </annotation>
                    </element>
                    <element name="diameter" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The diameter of the borehole over the depth interval
                                reported.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="computedBoreholeCrossSectionalArea"
                        type="eml:AreaMeasureExt">
                        <annotation>
                            <documentation>Cross-sectional area of the borehole, computed from
                                inferred borehole diameter for the interval</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="computedBoreholeVolume" type="eml:VolumeMeasureExt">
                        <annotation>
                            <documentation>Volume of the boreholein this interval, computed from the
                                inferred borehole diameter.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="BoreholeEvent" type="diggs:BoreholeEventType"
        substitutionGroup="diggs:AbstractEvent">
        <annotation>
            <documentation>Depth and/or time related information recorded during construction of the
                borehole.These events are intended to record information that is non-geological.
                Typically this includes drillers comments usually found on the boring or drilling
                log, for reporting incidents during drilling (such as "Fishing for broken U100"),
                drilling records that don't readily fit in any other groups (such as "Pushing
                boulder ahead of casing"), observations that are not strictly geological (such as
                "Strong petrol smell").</documentation>
        </annotation>
    </element>
    <complexType name="BoreholeEventPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:BoreholeEvent"/>
        </sequence>
    </complexType>
    <complexType name="BoreholeEventType">
        <complexContent>
            <extension base="diggs:AbstractEventType">
                <sequence>
                    <element minOccurs="0" name="casingBottom"
                        type="diggs:PointLocationPropertyType">
                        <annotation>
                            <documentation>Measured Depth to Base of Casing installed at this event
                                time, in the hole's linear referencing system. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="holeBottom" type="diggs:PointLocationPropertyType">
                        <annotation>
                            <documentation>Measured Depth to Base of Hole at this event time,
                                reported in the hole's linear referencing system.</documentation>
                        </annotation>
                    </element>
                    <choice>
                        <element minOccurs="0" name="waterDepth"
                            type="diggs:PointLocationPropertyType">
                            <annotation>
                                <documentation>Depth to Water Surface as measured at this event
                                    time, recorded in the hole's linear referencing
                                    system.</documentation>
                            </annotation>
                        </element>
                        <element minOccurs="0" name="isDry" type="boolean" fixed="true"/>
                    </choice>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="BoreholeType">
        <complexContent>
            <extension base="diggs:AbstractLinearSamplingFeatureType">
                <sequence>
                    <element maxOccurs="1" minOccurs="0" name="whenConstructed"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The period of time when the hole is constructed. This
                                should include the entire time the drill rig is on
                                site.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="whenDestroyed"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The time period during which the hole was destroyed or
                                forever abandoned. This date must occur after all related
                                observations, measurements or activities had been performed in the
                                borehole, and should reflect the time after which no observations or
                                activities are possible in the hole.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="totalMeasuredDepth" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The measured depth to the bottom of the hole, measured in
                                a hole's linear referencing system.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" ref="diggs:holeBearing"/>

                    <element minOccurs="0" ref="diggs:holePlunge"/>

                    <element maxOccurs="1" minOccurs="0" name="boreholePurpose" type="gml:CodeType">
                        <annotation>
                            <documentation>A description of the purpose for drilling the hole (eg.
                                exploratory boring, monitoring well, etc.). Intended to come from a
                                controlled list.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="boreholeType"
                        type="gml:CodeType">
                        <annotation>
                            <documentation>A description of the type of boring, intended to come from a controlled lis ot terms. This is intended for use as a classifier that applications may use to identify types of boreholes that may require different data storage structures. It should not be used to describe the borehole construction method. The BoreholeConstructionMethod object should be used for such purposes.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="backfill" type="diggs:BackfillPropertyType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on construction of the borehole backfill
                                after drilling. Also used to record backfill installed during well
                                construction or rock grouting activities</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="casing" type="diggs:CasingPropertyType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on the borehole casing installed while
                                drilling and/or after completion of drilling.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="constructionMethod"
                        type="diggs:BoreholeConstructionMethodPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information regarding construction of the hole over
                                different depth intervals</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="constructionEvent"
                        type="diggs:BoreholeEventPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information about events recorded during construction of
                                the borehole.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" maxOccurs="unbounded" ref="diggs:chiseling"/>

                    <element name="drillAdvancement" maxOccurs="unbounded" minOccurs="0"
                        type="diggs:DrillAdvancementArrayPropertyType"/>
                    <element minOccurs="0" name="flush" type="diggs:FlushPropertyType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information related to flushing the borehole with fluid
                                (eg. fluid type, return, fluid color, etc.) </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="holeDiameter"
                        type="diggs:BoreholeDiameterPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on the borehole diameter with depth,
                                generally representing the bit size used within a borehole interval.
                                Detailed measurements of borehole derived from a caliper log is a
                                Test property resulting from a Wireline log procedure.
                            </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="waterStrike" type="diggs:WaterStrikePropertyType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on when ground water is struck during
                                drilling of the hole. Note, option for more than one waterstrike
                                property is deprecated in 2.6. Only one waterstrike property should
                                be used. Post-strike readings should use the postStrikeReading
                                property within the Waterstrike onject and not additional
                                waterstrike properties.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Boundary" substitutionGroup="diggs:AbstractObject" type="diggs:BoundaryType">
        <annotation>
            <documentation>An object that contains properties describing a layer, interval, or zone
                boundary (eg. dip angle, sharpness, etc.)</documentation>
        </annotation>
    </element>
    <complexType name="BoundaryPropertyType">
        <sequence maxOccurs="1">
            <element ref="diggs:Boundary"/>
        </sequence>
    </complexType>
    <complexType name="BoundaryType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" ref="diggs:location"/>
                    <element minOccurs="0" name="dipAngle" type="diggs:DipMeasureType">
                        <annotation>
                            <documentation><![CDATA[The inclinaton angle in degrees of the boundary surface, as measured downward from the horizontal.]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="dipDirection" type="eml:PlaneAngleMeasure">
                        <annotation>
                            <documentation><![CDATA[The direction of the true dip of the boundary surface, as measured clockwise with respect to true north.]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="distinctness" type="gml:CodeType">
                        <annotation>
                            <documentation><![CDATA[A controlled string (preferably) that defines how distinctly the boundary between zones is defined, as governed by both the contrast between adjacent zones and by the width of the boundary. (eg. sharp, gradational)]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="origin" type="gml:CodeType">
                        <annotation>
                            <documentation><![CDATA[A controlled string (preferably) that defines the specific nature or origin of the boundary. (eg. unconformity, fault, etc.)]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="topography" type="gml:CodeType">
                        <annotation>
                            <documentation><![CDATA[A controlled string (preferably) that defines the shape of the boundary surface between zones. (eg. wavy)]]></documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute name="howDetermined" type="diggs:DescriptorMethodEnumType">
                    <annotation>
                        <documentation>A value that describes the method by which the observation or measurement
                            was determined. </documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <element name="BusinessAssociate" type="diggs:BusinessAssociateType"
        substitutionGroup="diggs:AbstractNamedFeature" abstract="false">
        <annotation>
            <documentation>A person or entity who performs functions, activities, or
                services.</documentation>
        </annotation>
    </element>
    <complexType name="BusinessAssociatePropertyType">
        <sequence>
            <element ref="diggs:BusinessAssociate" minOccurs="0" maxOccurs="1"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <complexType name="BusinessAssociateType">
        <complexContent>
            <extension base="diggs:BusinessAssociateBaseType">
                <sequence>
                    <element name="title" type="gml:CodeType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>A title for a person (eg. Mr., Ms., Sra., Dr. etc) that precedes the name. Corporate titles (eg. Inc., Ltd., etc) or suffixes (eg. PhD) would not be entered here, but included in the BusinessAssociate's name.</documentation>
                        </annotation>
                    </element>
                    <element name="address" type="diggs:AddressPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Mailing address for the BusinessAssociate</documentation>
                        </annotation>
                    </element>
                    <element name="emailAddress" type="diggs:EmailType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>An email address for the BusinessAssociate. The type of email (eg. business or personal) is defined in the type attribute.</documentation>
                        </annotation>
                    </element>
                    <element name="phoneNumber" type="diggs:PhoneType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>A telephone number for the BusinessAssociate. The type of number (eg. mobile, fax, etc.) is described in the type attribute.</documentation>
                        </annotation>
                    </element>
                    <element name="associatedWith" type="diggs:BusinessAssociatePropertyType"
                        minOccurs="0" maxOccurs="unbounded">
                        <annotation>
                            <appinfo source="urn:x-gml:targetElement">diggs:BusinessAssociate</appinfo>
                            <documentation>A BusinessAssociate that is associated with this one. This can be an xlink:href pointer to the gml:id of another BusinessAssociate object or an embedded BusinessAssociate object</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="BusinessAssociateBaseType">
        <complexContent>
            <restriction base="diggs:AbstractNamedFeatureType">

                <sequence>
                    <sequence>
                        <element minOccurs="0" ref="gml:description"/>
                        <element minOccurs="0" ref="gml:identifier"/>
                    </sequence>
                    <sequence>
                        <element maxOccurs="unbounded" minOccurs="1" ref="gml:name"/>
                        <element minOccurs="0" name="internalIdentifier"
                            type="gml:CodeWithAuthorityType">
                            <annotation>
                                <documentation>The value of this property is the identifier
                                    originally created by the authority for this feature, or that is
                                    used as the identifier in the authority's internal data
                                    management system. There is no assumption as to the unique scope
                                    or persistence of this identifier. In cases where the original
                                    or internal identifier does not meet the semantic requirements
                                    for gml:id or gml:identifier, the internal identifier may be
                                    included in this property in order for the originating authority
                                    to "map back" the identifier to an internal data management
                                    system. The codeSpace attribute must be populated to identify
                                    the authority that uses the internalIdentifier
                                    value.</documentation>
                            </annotation>
                        </element>
                        <element minOccurs="0" ref="diggs:status">
                            <annotation>
                                <documentation>A text string to provide information about the status
                                    of the object to be used to track QA/QC controls, review or
                                    release status, etc. The values used are intended to come from a
                                    controlled list of terms maintained by an
                                    organization.</documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="unbounded" minOccurs="0" name="associatedFile"
                            type="diggs:AssociatedFilePropertyType">
                            <annotation>
                                <documentation>Identifies external files associated with this
                                    feature. This allows for the feature to be further elaborated
                                    with information that cannot be represented by ASCII text, such
                                    as a photograph or other media, binary data, or a formatted
                                    report.</documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="unbounded" minOccurs="0" name="remark"
                            type="diggs:RemarkPropertyType">
                            <annotation>
                                <documentation>Any comment or remark associated with this specific
                                    feature.</documentation>
                            </annotation>
                        </element>
                    </sequence>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <element name="Calibration" type="diggs:CalibrationType"
        substitutionGroup="diggs:AbstractFeature" abstract="false">
        <annotation>
            <documentation>An object containing properties pertaining to instrument
                calibration.</documentation>
        </annotation>
    </element>
    <complexType name="CalibrationPropertyType">
        <sequence>
            <element ref="diggs:Calibration" minOccurs="1" maxOccurs="1"/>
        </sequence>
    </complexType>
    <complexType name="CalibrationType">
        <complexContent>
            <extension base="diggs:AbstractFeatureType">
                <sequence>
                    <element minOccurs="0" name="calibrationData" type="gml:StringOrRefType">
                        <annotation>
                            <documentation>Procedure and recorded data obtained during calibration.
                                This can be represented as text or as a reference to another object
                                or external file via an xlink:href attribute</documentation>
                        </annotation>
                    </element>
                    <element name="cqlibrationValues" type="diggs:ParameterArrayPropertyType"
                        minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Date calibration was perfomed</documentation>
                        </annotation>
                    </element>
                    <element name="date" type="gml:TimePositionType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Date calibration was perfomed</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="useSinceLastCalibration"
                        type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>Note about the amount of use of the equipment since the
                                last calibration.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Casing" type="diggs:CasingType">
        <annotation>
            <documentation>An object containing properties pertaining to borehole
                casing.</documentation>
        </annotation>
    </element>
    <complexType name="CasingPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:Casing"/>
        </sequence>
    </complexType>
    <complexType name="CasingType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="casingLocation"
                        type="diggs:LinearExtentPropertyType">
                        <annotation>
                            <documentation>The depth interval of the casing after fully installed
                                and advanced within the borehole. If omitted, it is assumed that the
                                casing information pertains to the entire length of the borehole or
                                well.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="casingOutsideDiameter" type="eml:LengthMeasure"/>
                    <element minOccurs="0" name="casingInsideDiameter" type="eml:LengthMeasure"/>
                    <element minOccurs="0" name="casingWallThickness" type="eml:LengthMeasure"/>
                    <element minOccurs="0" name="casingMaterial" type="gml:CodeType">
                        <annotation>
                            <documentation>The material that the casing is made of, eg. PVC,
                                stainless steel, etc. Intended to come from a controlled list of
                                terms.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="numberGroutPorts"
                        type="positiveInteger">
                        <annotation>
                            <documentation>If casing is an overburden casing as sleeve pipe (OCSP)
                                or other casing through which grout is injected, this property
                                records the number of ports in the casing.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="timeCasingInstalled"
                        type="diggs:TimeIntervalType">
                        <annotation>
                            <documentation>The time interval over which the casing was installed
                            </documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="timeCasingRemoved"
                        type="diggs:TimeIntervalType">
                        <annotation>
                            <documentation>The time interval during which the casing was removed
                            </documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="casingAdvancement"
                        type="diggs:CasingAdvancementPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="CasingAdvancement" type="diggs:CasingAdvancementType">
        <annotation>
            <documentation>If casing is advanced while drilling, or retracted during an activity,
                like grouting, this object records the time interval when casing
                advancement/retraction occurs, along with the start and end position of the casing
                bottom.</documentation>
        </annotation>
    </element>
    <complexType name="CasingAdvancementPropertyType">
        <sequence>
            <element ref="diggs:CasingAdvancement"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <complexType name="CasingAdvancementType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element maxOccurs="1" minOccurs="0" name="advancementTime"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>Time at start and end of the casing advancement
                                interval</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="casingBaseAtStart"
                        type="diggs:PointLocationPropertyType">
                        <annotation>
                            <documentation>The location of the bottom at the casing at the beginning
                                of the casing interval.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="casingBaseAtEnd"
                        type="diggs:PointLocationPropertyType">
                        <annotation>
                            <documentation>The location of the bottom at the casing at the end of
                                the casing advancement interval.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="casingBlows" type="positiveInteger">
                        <annotation>
                            <documentation>If casing is driven, the number of blows to drive the
                                casing the reported distance. Details about the process should be
                                reported in the relevant equipment or construction method
                                object.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="ChainOfCustodyEvent" type="diggs:ChainOfCustodyEventType">
        <annotation>
            <documentation>An object containing properties pertaining to the chain of custody of a
                sample.</documentation>
        </annotation>
    </element>
    <complexType name="ChainOfCustodyEventPropertyType">
        <sequence>
            <element ref="diggs:ChainOfCustodyEvent"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <complexType mixed="false" name="ChainOfCustodyEventType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="sourceCustodian"
                        type="diggs:BusinessAssociatePropertyType">
                        <annotation>
                            <documentation> A reference to the BusinessAssociate object that is
                                releasing custody of the sample.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="destinationCustodian"
                        type="diggs:BusinessAssociatePropertyType">
                        <annotation>
                            <documentation> A reference to the BusinessAssociate object that is
                                receiving custody of the sample.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="dateInitiated" type="gml:TimePositionType">
                        <annotation>
                            <documentation><![CDATA[Date that sample was shipped or date that chain of custody event was initiated]]></documentation>
                        </annotation>
                    </element>
                    <element name="dateCompleted" type="gml:TimePositionType" minOccurs="0">
                        <annotation>
                            <documentation><![CDATA[Date that sample was received or date that chain of custody event was completed]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="sampleContainer" type="diggs:ContainerPropertyType">
                        <annotation>
                            <documentation><![CDATA[Information about the sample container, if repackaged from the initial container.]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="shippingContainer"
                        type="diggs:ContainerPropertyType">
                        <annotation>
                            <documentation><![CDATA[Information about the container that the sample containers are transported in.]]></documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="storageLocation"
                        type="diggs:LocalityPropertyType">
                        <annotation>
                            <documentation>The location of the sample once it has reached it's
                                destination. Can be expressed as properties of a Locality object
                                (eg. address or other local term describing location, or as a
                                coordinate point (PointLocation) </documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="dataValues" substitutionGroup="gml:tupleList" type="gml:CoordinatesType">
        <annotation>
            <documentation>A property that holds a string of data values as part of a measurement
                result set.</documentation>
        </annotation>
    </element>
    <element name="Color" substitutionGroup="diggs:AbstractComponentObject" type="diggs:ColorType">
        <annotation>
            <documentation>An object that describes the color of earth materials.</documentation>
        </annotation>
    </element>
    <simpleType name="ColorCharacterEnumType">
        <union>
            <simpleType>
                <restriction base="string">
                    <enumeration value="banded"/>
                    <enumeration value="mottled"/>
                    <enumeration value="multicolored"/>
                    <enumeration value="uniform"/>
                    <enumeration value="variegated"/>
                </restriction>
            </simpleType>
            <simpleType>
                <restriction base="string">
                    <pattern value="Other: .{2,}"/>
                </restriction>
            </simpleType>
        </union>
    </simpleType>
    <simpleType name="ColorOriginEnumType">
        <union>
            <simpleType>
                <restriction base="string">
                    <enumeration value="matrix"/>
                    <enumeration value="mottle"/>
                    <enumeration value="clay depletion"/>
                    <enumeration value="iron depletion"/>
                    <enumeration value="iron Fe2 mass"/>
                    <enumeration value="iron Fe3 mass"/>
                    <enumeration value="iron-manganese mass"/>
                    <enumeration value="jarosite mass"/>
                    <enumeration value="manganese mass"/>
                    <enumeration value="ironstone nodule"/>
                    <enumeration value="iron-manganese nodule"/>
                    <enumeration value="jarosite nodule"/>
                    <enumeration value="plinthite"/>
                    <enumeration value="iron-manganese concretion"/>
                    <enumeration value="manganese coat or film"/>
                    <enumeration value="ferriargillans coat or film"/>
                    <enumeration value="disseminated carbonate"/>
                    <enumeration value="disseminated salts"/>
                    <enumeration value="disseminated gypsum"/>
                    <enumeration value="barite mass"/>
                    <enumeration value="gypsum mass"/>
                    <enumeration value="carbonate mass"/>
                    <enumeration value="salt mass"/>
                    <enumeration value="clay body"/>
                    <enumeration value="silica mass"/>
                    <enumeration value="gypsum crystal clusters"/>
                    <enumeration value="carbonate nodule"/>
                    <enumeration value="durinode (SiO2) nodule"/>
                    <enumeration value="gibbsite (Al2O3) nodule"/>
                    <enumeration value="opal nodule"/>
                    <enumeration value="ortstein nodule"/>
                    <enumeration value="carbonate concretion"/>
                    <enumeration value="gibbsite concretion"/>
                    <enumeration value="silica concretion"/>
                    <enumeration value="titanium oxide concretion"/>
                    <enumeration value="barite crystals"/>
                    <enumeration value="calcite crystals"/>
                    <enumeration value="gypsum crystals"/>
                    <enumeration value="salt crystals"/>
                    <enumeration value="satin spar crystals"/>
                    <enumeration value="selenite crystals"/>
                </restriction>
            </simpleType>
            <simpleType>
                <restriction base="string">
                    <pattern value="Other: .{2,}"/>
                </restriction>
            </simpleType>
        </union>
    </simpleType>

    <element name="ColorObservation" substitutionGroup="diggs:AbstractObservation"
        type="diggs:ColorObservationType">
        <annotation>
            <documentation>A color observation describes the color of materials encountered. All
                color observations within a color observation system must not overlap, although
                multiple colors can be described within a single zone.</documentation>
        </annotation>
    </element>
    <complexType name="ColorObservationPropertyType">
        <sequence maxOccurs="1">
            <element maxOccurs="1" ref="diggs:ColorObservation">
                <annotation>
                    <documentation>Color observations must not overlap</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <complexType name="ColorObservationType">
        <complexContent>
            <extension base="diggs:AbstractObservationType">
                <sequence>
                    <element maxOccurs="unbounded" name="color" type="diggs:ColorPropertyType"/>
                    <element maxOccurs="unbounded" minOccurs="0" ref="diggs:placedObservation"/>
                    <element minOccurs="0" ref="diggs:baseBoundary" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Description of the boundary at the base of the observed
                                zone or interval as defined in the observation's location
                                property</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" ref="diggs:character"/>

                </sequence>
            </extension>
        </complexContent>
    </complexType>

    <complexType name="ColorPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:Color"/>
        </sequence>
        <!-- These attributes now in Color object 
        <attribute name="character" type="diggs:ColorCharacterEnumType">
            <annotation>
                <documentation>Deprecated - use attribute in Color object instead</documentation>
            </annotation>
        </attribute>
        <attribute name="origin" type="diggs:ColorOriginEnumType">
            <annotation>
                <documentation>Deprecated - use attribute in Color object instead</documentation>
            </annotation>
        </attribute>
        -->
    </complexType>
    <complexType name="ColorType">
        <complexContent>
            <extension base="diggs:ComponentObjectNoDescriptionType">
                <sequence>
                    <choice>
                        <element minOccurs="1" name="colorCode" type="diggs:DescriptorCodeType">
                            <annotation>
                                <documentation>The code value that defines the color; preferably defined by an authority. Typically this would be a Munsell color code. (eg. 10YR 4/3)</documentation>
                            </annotation>
                        </element>
                        <sequence>
                            <element minOccurs="1" name="colorName" type="diggs:DescriptorCodeType"
                                maxOccurs="1">
                                <annotation>
                                    <documentation>The name of the color, preferably defined by an
                                        authority defined in the codespace attribute (eg. reddish
                                        brown)</documentation>
                                </annotation>
                            </element>
                            <element minOccurs="0" name="colorCode" type="diggs:DescriptorCodeType">
                                <annotation>
                                    <documentation>The code value that defines the color; preferably defined by an authority. Typically this would be a Munsell color. (eg. 10YR4/3)</documentation>
                                </annotation>
                            </element>
                        </sequence>
                    </choice>
                    <element minOccurs="0" name="colorComponents"
                        type="diggs:ColorComponentsPropertyType"/>
                    <choice>
                        <element name="abundanceCode" type="gml:CodeType" minOccurs="0">
                            <annotation>
                                <documentation>A measure of the relative amount of the color present. Terms such as few, rare, common, etc. represent relative abundance as a range of percentages that are specific to different standards bodies, so the use of these terms should reference a codelist dictionary using the codeSpace attribute.. Specific percentage estimates should use the abundancePercent and/or maxAbundancePercent properties.</documentation>
                            </annotation>
                        </element>
                        <sequence>
                            <element name="abundancePercent" type="diggs:AbundanceMeasureType"
                                minOccurs="0">
                                <annotation>
                                    <documentation>A measure of the amount of the color present, expressed as a percentage. If expressing the percentage as a range - eg. 30-50%, this property should report the lower estimate and maxAbuncancePercentage should be used to report the upper estimate.</documentation>
                                </annotation>
                            </element>
                            <element name="maxAbundancePercent" type="diggs:AbundanceMeasureType"
                                minOccurs="0">
                                <annotation>
                                    <documentation>If expressing the percentage of a color as a range - eg. 30-50%, this property should report the the upper estimate.</documentation>
                                </annotation>
                            </element>
                        </sequence>
                    </choice>
                    <element minOccurs="0" name="preface" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>A string value that would be used to preface the color code or name in a programmatically constructed description for display purposes. Values like "with", "trending towards" or "and" are commonly used. For example, a secondary color of gray might have a preface of "with". When combined in a description with a primary color of brown would produce the phrase "brown with gray"</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute name="character" type="diggs:ColorCharacterEnumType">
                    <annotation>
                        <documentation>Describes the character of the color(s) in the associated
                            unit, from the following enumerated list: banded - multiple colors occur
                            in horizontal layers within the unit mottled - unit consists of a
                            pattern of irregular spots, blotches or patches of a different color
                            than the unit matrix color multicalored - unit consists of multiple
                            colors where there is no description of the pattern or character of the
                            various colors uniform - unit consists of a single color variegated - a
                            multicolored unit containing spots, streaks, or blotches of multiple
                            colors </documentation>
                    </annotation>
                </attribute>
                <attribute name="origin" type="diggs:ColorOriginEnumType">
                    <annotation>
                        <documentation>A term from an enumerated list that identifies the location
                            (eg matrix or mottle), or the source/cause of the color described.
                            Defined terms are: matrix - the color of the soil or rock matrix mottle
                            - the color of soil mottles clay depletion - color caused by depletion
                            of clay iron depletion - color caused by depletion of iron iron Fe2 mass
                            - color caused by masses of reduced iron iron Fe3 mass - color caused by
                            masses of oxidized iron iron-manganese mass - color caused by masses of
                            iron and manganese jarosite mass - color caused by masses of jarosite
                            manganese mass - color caused by masses of manganese ironstone module -
                            color caused by ironstone nodules iron-manganese nodule - color caused
                            by iron-manganese nodules jarosite nodule - color caused by jarosite
                            nodules plinthite - color caused by plinthite(s) (an iron-rich,
                            humus-poor mixture of clay with quartz and other minerals).
                            iron-manganese concretion - color caused by iron-manganese concretions
                            manganese coat or film - color caused by manganese coats or films
                            disseminated carbonate - color caused by disseminated calcium carbonate
                            disseminated salts - color caused by disseminated unspecified salts
                            disseminated gypsum - color caused by disseminated gypsum barite mass -
                            color caused by masses of barite gypsum mass - color caused by masses of
                            gypsum carbonate mass - color caused by masses of calcium carbonate salt
                            mass - color caused by masses of unspecified salt clay body - color
                            caused by included bodies of clay silica mass - color caused by masses
                            of silica gypsum crystal clusters - color caused by crystal clusters of
                            gypsum carbonate nodule - color caused by nodules of carbonate durinode
                            (SiO2) nodule - color caused by nodules of SiO2 gibbsite (Al1O3) nodule
                            - color caused by nodules of Al2O3 opal nodule - color caused by nodules
                            of opal ortstein nodule - color caused by hardpans cemented with iron
                            and organic matter carbonate concretion - color caused by concretions of
                            calcium carbonate gibbsite concretion - color caused by concretions of
                            gibbsite silica concretion - color caused by concretions of silica
                            titanium oxide - color caused by concretions of titanium oxide barite
                            crystals - color caused by crystals of barite calcite crystals - color
                            caused by calcite crystals gypsum crystals - color caused by gypsum
                            crystals salt crystals - color caused by salt crystals satin spar
                            crystals - color caused by crystals of satin spar gypsum selenite
                            crystals - color caused by crystals of selenite gypsum</documentation>
                    </annotation>
                </attribute>
                <attribute name="rank" type="positiveInteger" use="optional">
                    <annotation>
                        <documentation>A positive integer value that identifies the relative significance or importance of the color, with 1 signifying the highest rank. Using this attribute eliminates possible ambiguity when using abundanceCode to infer significance.</documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="ColorComponentsType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element minOccurs="0" ref="diggs:intensity"/>
                    <element minOccurs="0" name="modifier" type="diggs:modifierEnumExtType">
                        <annotation>
                            <documentation>The second term of a color description, if used (or first if intensity is not used), that modifies the base hue value, eg. yellowish, reddish, creamy, olive, etc.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="1" name="hue" type="diggs:hueEnumExtType">
                        <annotation>
                            <documentation>The base hue of the soil or rock color (eg. Black, Tan, Buff, Gray, Red, etc.). This property is mandatory.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="ColorComponentsPropertyType">
        <sequence>
            <element ref="diggs:ColorComponents"/>
        </sequence>
    </complexType>
    <element name="ColorComponents" type="diggs:ColorComponentsType">
        <annotation>
            <documentation>An object that holds the components of a Munsell color description (intensity, modifier, and hue). These components can be used to programmatically construct a color description, for example:
1) intensity = dark
2) modifier = greenish
3) hue = Gray
can be used to construct a color name of "dark greenish Grey" which, for example, would correspond to one or more Munsell color codes.</documentation>
        </annotation>
    </element>
    <element name="ColorSystem" substitutionGroup="diggs:AbstractObservationSystem"
        type="diggs:ColorSystemType">
        <annotation>
            <documentation>An object that contains a system of color observations.</documentation>
        </annotation>
    </element>
    <complexType name="ColorSystemType">
        <complexContent>
            <extension base="diggs:AbstractObservationSystemType">
                <sequence>
                    <element name="colorType" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A text string defining the kind of "Color Description"
                                system described *("eg. Munsell Color", "wet color".
                            </documentation>
                        </annotation>
                    </element>
                    <element name="colorObservation" type="diggs:ColorObservationPropertyType"
                        maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="ComponentLithology" substitutionGroup="diggs:AbstractObject"
        type="diggs:ComponentLithologyType">
        <annotation>
            <documentation>A component lithology is a distict lithologic type that occurs within a lithologic zone (observation) and not descxribed as part of the primary lithology. This primarily occurs in situations where the zone is interbedded and complex enough that separating out each lithologic layer is not practical, or where one lithology occurs as inclusion within another.</documentation>
        </annotation>
    </element>
    <complexType name="ComponentLithologyPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:ComponentLithology"/>
        </sequence>
    </complexType>
    <complexType name="ComponentLithologyType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence maxOccurs="1" minOccurs="1">
                    <element maxOccurs="1" minOccurs="1" name="lithology"
                        type="diggs:ComponentLithPropertyType">
                        <annotation>
                            <documentation>A property that contains a ComponentLith object that describes the component lithology.</documentation>
                        </annotation>
                    </element>
                    <choice>
                        <element name="abundanceCode" type="gml:CodeType" minOccurs="0">
                            <annotation>
                                <documentation>A measure of the relative amount of the subordinate lithology present as a string, Terms such as few, rare, common, etc. represent relative abundance as a range of percentages that are specific to different standards bodies, so the use of these terms should reference a codelist dictionary using the codeSpace attribute.. Specific percentage estimates should use the abundancePercent and/or maxAbundancePercent properties.</documentation>
                            </annotation>
                        </element>
                        <sequence>
                            <element name="abundancePercent" type="diggs:AbundanceMeasureType"
                                minOccurs="0">
                                <annotation>
                                    <documentation>A measure of the amount of the lithologic component present, expressed as a percentage. If expressing the percentage as a range - eg. 30-50%, this property should report the lower estimate and maxAbuncancePercentage should be used to report the upper estimate.</documentation>
                                </annotation>
                            </element>
                            <element name="maxAbundancePercent" type="diggs:AbundanceMeasureType"
                                minOccurs="0">
                                <annotation>
                                    <documentation>If expressing the percentage of the lithologic component as a range - eg. 30-50%, this property should report the the upper estimate.</documentation>
                                </annotation>
                            </element>
                        </sequence>
                    </choice>
                </sequence>
                <attribute name="association" type="diggs:LithologyCharacterEnumExtType"/>
                <attribute name="rank" type="positiveInteger" use="optional">
                    <annotation>
                        <documentation>A positive integer value that identifies the relative significance or importance of the compomemt lithology, with 1 signifying the highest rank. Using this attribute eliminates possible ambiguity when using abundanceCode to infer significance.</documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <element name="Constituent" type="diggs:ConstituentType">
        <annotation>
            <documentation>An object that describes minor constituents within a lithology
                zone.</documentation>
        </annotation>
    </element>
    <simpleType name="ConstituentCategoryEnumExtType">
        <union memberTypes="diggs:ConstituentCategoryEnumType diggs:OtherNameType"/>
    </simpleType>
    <simpleType name="ConstituentCategoryEnumType">
        <annotation>
            <documentation>Categories of constituents found in sediments and soils</documentation>
        </annotation>
        <restriction base="string">
            <enumeration value="core disturbance">
                <annotation>
                    <documentation>For a core sample of rock or soil, the kind and intensity of disturbance to the sample as a result of the sampling process. Common terms are biscuiting, fluid intrusion, drilling breccia, fractured, moderately disturbed, soupy, partial void, etc. </documentation>
                </annotation>
            </enumeration>
            <enumeration value="diagenetic features">
                <annotation>
                    <documentation>Physical, chemical, and biological changes that occur in sediments after their initial deposition and during and after their lithification. Includes features like concretions, nodules, mineral replacement, cementation, and dissolution structures.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="fossils">
                <annotation>
                    <documentation>Preserved remains, impressions, or traces of ancient life forms in sedimentary rocks. Includes body fossils such as shells, bones, teeth, leaves, and other preserved organic remains of once-living organisms.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="hydrocarbons">
                <annotation>
                    <documentation>Organic compounds consisting of hydrogen and carbon, including oil, natural gas, bitumen, and other petroleum products found within sedimentary rocks and soils. May appear as staining, residues, or accumulations.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="lithologic">
                <annotation>
                    <documentation>Rock and mineral components of the soil or sediment, including the present of sand/silt/clay, mineral or rock fragment.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="sedimentary structures">
                <annotation>
                    <documentation>Features formed during or shortly after sediment deposition, reflecting the physical processes of sedimentation. Includes bedding, lamination, cross-stratification, ripple marks, mud cracks, and graded bedding.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="trace fossils">
                <annotation>
                    <documentation>Preserved evidence of biological activity rather than preserved remains of the organism itself. Includes burrows, tracks, trails, borings, and other signs of organism behavior preserved in sedimentary rocks.</documentation>
                </annotation>
            </enumeration>
        </restriction>
    </simpleType>
    <element name="ConstituentObservation" substitutionGroup="diggs:AbstractObservation"
        type="diggs:ConstituentObservationType">
        <annotation>
            <documentation>Constituent observations describe details of earth materials encountered
                within a sampling feature. Constituent observations that are restricted to a
                specific lithologic zone are encoded as constituent properties in the Lithology
                zones themselves. </documentation>
        </annotation>
    </element>
    <complexType name="ConstituentObservationPropertyType">
        <sequence maxOccurs="1">
            <element maxOccurs="1" ref="diggs:ConstituentObservation"/>
        </sequence>
    </complexType>
    <complexType name="ConstituentObservationType">
        <complexContent>
            <extension base="diggs:AbstractObservationType">
                <sequence>
                    <element name="constituent" type="diggs:ConstituentPropertyType"
                        maxOccurs="unbounded"/>
                    <element maxOccurs="unbounded" minOccurs="0" ref="diggs:placedObservation"/>
                    <element minOccurs="0" ref="diggs:baseBoundary">
                        <annotation>
                            <documentation>Description of the boundary at the base of the observed
                                zone or interval as defined in the observation's location
                                property</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="ConstituentPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:Constituent">
                <annotation>
                    <documentation>A name (codeValue) that identifies a constituent within the extent of the described lithology (required) and optional description, along with a description of the abundance and distribution of this constituent (if applicable) within the lithologic extent described.</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <element name="ConstituentSystem" substitutionGroup="diggs:AbstractObservationSystem"
        type="diggs:ConstituentSystemType">
        <annotation>
            <documentation>An object that contains a system of constituent observations.
                Observations within a constituent system need not be continuous and may overlap, but
                zones with the same named constituents cannot overlap.</documentation>
        </annotation>
    </element>
    <complexType name="ConstituentSystemType">
        <complexContent>
            <extension base="diggs:AbstractObservationSystemType">
                <sequence>
                    <element name="constituentType" type="gml:CodeType">
                        <annotation>
                            <documentation>A text string defining the kind of "Constituent
                                Description" system described (eg. :"Fossils" or "Diagenesis".
                            </documentation>
                        </annotation>
                    </element>
                    <element name="constituentObservation"
                        type="diggs:ConstituentObservationPropertyType" maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="ConstituentType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element ref="gml:description" minOccurs="0"/>
                    <element minOccurs="0" ref="diggs:status">
                        <annotation>
                            <documentation>A text string to provide information about the status of
                                the object to be used to track QA/QC controls, review or release
                                status, etc. The values used are intended to come from a controlled
                                list of terms maintained by an organization.</documentation>
                        </annotation>
                    </element>
                    <element name="remark" type="diggs:RemarkPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.</documentation>
                        </annotation>
                    </element>
                    <element name="codeValue" type="diggs:ConstituentCategoryCodeType" minOccurs="0">
                        <annotation>
                            <documentation>The code value that defines the consituent (eg. "SM" or
                                "gastropod"; preferably defined by an authority identified in the
                                codespace attribute</documentation>
                        </annotation>
                    </element>
                    <choice>
                        <element name="abundanceCode" type="gml:CodeType" minOccurs="0">
                            <annotation>
                                <documentation>A measure of the relative amount of the constituent present as a string. Terms such as few, rare, common, etc. represent relative abundance as a range of percentages that are specific to different standards bodies, so the use of these terms should reference a codelist dictionary using the codeSpace attribute.. Specific percentage estimates should use the abundancePercent and/or maxAbundancePercent properties.</documentation>
                            </annotation>
                        </element>
                        <sequence>
                            <element name="abundancePercent" type="diggs:AbundanceMeasureType"
                                minOccurs="0">
                                <annotation>
                                    <documentation>A measure of the amount of the constituent present, expressed as a percentage. If expressing the percentage as a range - eg. 30-50%, this property should report the lower estimate and maxAbuncancePercentage should be used to report the upper estimate.</documentation>
                                </annotation>
                            </element>
                            <element name="maxAbundancePercent" type="diggs:AbundanceMeasureType"
                                minOccurs="0">
                                <annotation>
                                    <documentation>If expressing the percentage of a constituent as a range - eg. 30-50%, this property should report the the upper estimate.</documentation>
                                </annotation>
                            </element>
                        </sequence>
                    </choice>
                    <element name="distribution" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A description of how the constituent is distributed
                                within the interval (eg. scattered, sporadic, locally, etc.).
                                Intended to come from a controlled list</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute name="rank" type="positiveInteger" use="optional">
                    <annotation>
                        <documentation>A positive integer value that identifies the relative significance or importance of the constituent, with 1 signifying the highest rank. Using this attribute eliminates possible ambiguity when using abundanceCode to infer significance.</documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="false" name="Container" substitutionGroup="diggs:AbstractObject"
        type="diggs:ContainerType">
        <annotation>
            <documentation>A physical object that holds a sample</documentation>
        </annotation>
    </element>
    <complexType name="ContainerPropertyType">
        <sequence>
            <element ref="diggs:Container" maxOccurs="1" minOccurs="1"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <complexType name="ContainerType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="containerLabel" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>Identifier listed on the container holding the sample.
                                This might be a box number (if for core) or sample number, or the
                                same value as the sample name</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="containerType" type="gml:CodeType">
                        <annotation>
                            <documentation>Description of container for the sample; intended to be
                                derived from a controlled list.
                                Example:<![CDATA[Jar, Bucket, Vial, Bag, Box]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="containerMaterial" type="gml:CodeType">
                        <annotation>
                            <documentation>Description of the material that the container is made
                                of.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="containerHeight" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Height of the container</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="containerLength" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Length of the container</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="containerVolume" type="eml:VolumeMeasure">
                        <annotation>
                            <documentation>Volume of the container</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="containerWeight" type="eml:ForceMeasure">
                        <annotation>
                            <documentation>Weight of the container</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="containerWidth" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Width of the container</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="preservativeAdded" type="gml:CodeType">
                        <annotation>
                            <documentation>Example:<![CDATA[The type of preservative added to sample, if any.]]></documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Contract" type="diggs:ContractType" substitutionGroup="diggs:AbstractFeature"
        abstract="false">
        <annotation>
            <documentation>An object that contains properties of a business
                contract.</documentation>
        </annotation>
    </element>
    <complexType name="ContractPropertyType">
        <sequence>
            <element ref="diggs:Contract" minOccurs="1" maxOccurs="1"/>
        </sequence>
    </complexType>
    <complexType name="ContractType">
        <complexContent>
            <extension base="diggs:AbstractFeatureType">
                <sequence>
                    <element name="version" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>The version number or name of this contract</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="contractDate" type="gml:TimePositionType">
                        <annotation>
                            <documentation>The date the contrat went into effect.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="revisionDate" type="gml:TimePositionType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>The date when the contract was revised.</documentation>
                        </annotation>
                    </element>
                    <element name="type" type="gml:CodeType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>The type of contract. Intended to come from a controlled list of terms (eg. Time and Materials, Fixed Price, etc.)</documentation>
                        </annotation>
                    </element>
                    <element name="value" type="witsml:Cost" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>The total value of the contract; the currency attribute
                                holds the currency type.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="CoringDevice" type="diggs:CoringDeviceType"
        substitutionGroup="diggs:AbstractEquipment" abstract="false">
        <annotation>
            <documentation>An object that contains properties of a borehole coring
                device.</documentation>
        </annotation>
    </element>
    <complexType name="CoringDeviceType">
        <complexContent>
            <extension base="diggs:AbstractEquipmentType">
                <sequence>
                    <element minOccurs="0" name="areaRatio" type="eml:AreaPerAreaMeasure">
                        <annotation>
                            <documentation>A sample disturbance parameter, defined as the difference
                                of the squares of the outside and inside diameter of the cutting
                                shoe, divided by the square of the inside diameter of the cutting
                                shoe.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="barrelExtension" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Distance that coring device extends beyond drill bit at
                                full extension. Negative values indicate barrel is recessed behind
                                bit.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="barrelInnerDiameter" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Diamter of inside of core barrel or sampling tube
                            </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="barrelOuterDiameter" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Diameter of outside of core barrel or sampling
                                tube</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="barrelLength" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Length of core barrel or sampling tube</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="insideClearanceRatio"
                        type="eml:LengthPerLengthMeasure">
                        <annotation>
                            <documentation>The inside sample diameter minus the cutting shoe inside
                                diameter divided by the cutting shoe inside diameter, expressed as a
                                percentage. A sample disturbance parameter.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="linerPresent" type="boolean">
                        <annotation>
                            <documentation>True if a liner is present in the barrel.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="linerType" type="gml:CodeType">
                        <annotation>
                            <documentation>The type of liner material or the type of coating within
                                the coring device (eg. porcelain coating on a shelby tube). Intended
                                to come from a controlled list of terms.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="outsideClearanceRatio"
                        type="eml:LengthPerLengthMeasure">
                        <annotation>
                            <documentation>The outside cutting shoe diameter minus the outside
                                sampler diameter, divided by the outside sampler diameter, expressed
                                as a percentage. A sample disturbance parameter.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="shoeInnerDiameter" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Inner diameter of the cutting shoe</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="shoeLength" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Length of the core shoe, eg. the device that fastens onto
                                the lower end of the main core barrel.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="shoeOuterDiameter" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Inner diameter of the cutting shoe</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="shoeType" type="gml:CodeType">
                        <annotation>
                            <documentation>Refers to the type of shoe used, typically manufacturer
                                specific.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="DelayEvent" type="diggs:DelayEventType" substitutionGroup="diggs:AbstractObject"
        abstract="false">
        <annotation>
            <documentation>An object that describes the properties of time delay between activities
                of a driven penetration or vane test procedure.</documentation>
        </annotation>
    </element>
    <complexType name="DelayEventPropertyType">
        <sequence>
            <element ref="diggs:DelayEvent" minOccurs="1" maxOccurs="1"/>
        </sequence>
    </complexType>
    <complexType name="DelayEventType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <choice>
                        <element name="timeOfDelay" type="diggs:TimeIntervalPropertyType"
                            minOccurs="1" maxOccurs="1">
                            <annotation>
                                <documentation>The time interval of the delay. Requies an absolute time for the start of the delay and either an end time or duration.
</documentation>
                            </annotation>
                        </element>
                        <element name="delayDuration" type="eml:TimeMeasure"/>
                    </choice>
                    <element name="delayType" type="gml:CodeType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>A description of the type of delay, intended to come from a ontrolled list of terms (eg. mechanical, operational, soil-response, etc.)</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="DescriptorType">
        <simpleContent>
            <extension base="string">
                <attribute name="howDetermined" type="diggs:DescriptorMethodEnumType">
                    <annotation>
                        <documentation>A value that describes the method by which the observation or measurement
                            was determined. </documentation>
                    </annotation>
                </attribute>
                <attribute name="legendCode" type="string">
                    <annotation>
                        <documentation>Deprecated - use legendCode property instead</documentation>
                    </annotation>
                </attribute>
            </extension>
        </simpleContent>
    </complexType>
    <complexType name="DescriptorCodeType">
        <simpleContent>
            <extension base="gml:CodeType">
                <attribute name="howDetermined" type="diggs:DescriptorMethodEnumType">
                    <annotation>
                        <documentation>A value that describes the method by which the observation or measurement
                            was determined. </documentation>
                    </annotation>
                </attribute>
            </extension>
        </simpleContent>
    </complexType>
    <complexType name="ConstituentCategoryCodeType">
        <simpleContent>
            <extension base="gml:CodeType">
                <attribute name="howDetermined" type="diggs:DescriptorMethodEnumType">
                    <annotation>
                        <documentation>A value that describes the method by which the observation or measurement
                            was determined. </documentation>
                    </annotation>
                </attribute>
                <attribute name="category" type="diggs:ConstituentCategoryEnumExtType">
                    <annotation>
                        <documentation>Identifies the type of constituent being described, eg. lithology, fossils, etc. From an enumerated list.</documentation>
                    </annotation>
                </attribute>
            </extension>
        </simpleContent>
    </complexType>
    <simpleType name="DescriptorMethodEnumType">
        <annotation>
            <documentation/>
        </annotation>
        <restriction base="string">
            <enumeration value="assigned">
                <annotation>
                    <documentation>Value is assigned a priori as a commonly used value or by assumption</documentation>
                </annotation>
            </enumeration>
            <enumeration value="calculated">
                <annotation>
                    <documentation>Value is computed directly from other value(s)</documentation>
                </annotation>
            </enumeration>
            <enumeration value="extrapolated">
                <annotation>
                    <documentation>Value is estimated by extrapolating trends in the known data</documentation>
                </annotation>
            </enumeration>
            <enumeration value="graphic">
                <annotation>
                    <documentation>Value is manually picked from a graph or visual display</documentation>
                </annotation>
            </enumeration>
            <enumeration value="inferred">
                <annotation>
                    <documentation>Value is estimated from some indirect measurements such as from a wireline log or transducer.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="interpolated">
                <annotation>
                    <documentation>Value is estimated betweem two known values using some presumed
 function</documentation>
                </annotation>
            </enumeration>
            <enumeration value="maximum">
                <annotation>
                    <documentation>Value is the largest value inferred for the property</documentation>
                </annotation>
            </enumeration>
            <enumeration value="measured">
                <annotation>
                    <documentation>Value is determined directly from a laboratory or in situ test </documentation>
                </annotation>
            </enumeration>
            <enumeration value="minimum">
                <annotation>
                    <documentation>Value is the smallest value inferred for the property</documentation>
                </annotation>
            </enumeration>
            <enumeration value="missing">
                <annotation>
                    <documentation>Method known but not reported here</documentation>
                </annotation>
            </enumeration>
            <enumeration value="modeled">
                <annotation>
                    <documentation>Value is estimated from a representation of the measured feature</documentation>
                </annotation>
            </enumeration>
            <enumeration value="moving average">
                <annotation>
                    <documentation>Value is calculated as a moving average of reading</documentation>
                </annotation>
            </enumeration>
            <enumeration value="other">
                <annotation>
                    <documentation>Method other than the choices in this list. Further information should be provided in the remarks property</documentation>
                </annotation>
            </enumeration>
            <enumeration value="reported">
                <annotation>
                    <documentation>Value or description comes from a third party source</documentation>
                </annotation>
            </enumeration>
            <enumeration value="unknown">
                <annotation>
                    <documentation>Method of determination unknown and can likely not be determined </documentation>
                </annotation>
            </enumeration>
            <enumeration value="visual">
                <annotation>
                    <documentation>Value or description comes from visual or visual/manual inspection</documentation>
                </annotation>
            </enumeration>
        </restriction>
    </simpleType>
    <complexType name="MeasurementTechniqueEnumType">
        <simpleContent>
            <extension base="diggs:DescriptorMethodEnumType">
                <attribute name="formula" type="string">
                    <annotation>
                        <documentation>A description of the formula used to obtain the measurement
                            result.</documentation>
                    </annotation>
                </attribute>
            </extension>
        </simpleContent>
    </complexType>
    <complexType name="DescriptorValueType" abstract="false">
        <simpleContent>
            <extension base="double">
                <attribute name="howDetermined" type="diggs:DescriptorMethodEnumType">
                    <annotation>
                        <documentation>A value that describes the method by which the observation or measurement
                            was determined. </documentation>
                    </annotation>
                </attribute>
            </extension>
        </simpleContent>
    </complexType>
    <element abstract="false" name="Detector" substitutionGroup="diggs:AbstractObject"
        type="diggs:DetectorType">
        <annotation>
            <documentation>A component of a sensor that measures one specific property (measurand),
                optionally along a single geometric axis</documentation>
        </annotation>
    </element>
    <complexType name="DetectorPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:Detector"/>
        </sequence>
    </complexType>
    <complexType name="DetectorType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="detectorLocation" type="diggs:LocationPropertyType">
                        <annotation>
                            <documentation>The location that the detector measures (eg response zone
                                of the detector)</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="measurand"
                        type="gml:CodeWithAuthorityType">
                        <annotation>
                            <documentation>Contains the code value of the property being measured.
                                Codespace must be defined and the value should occur within a
                                dictionary</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="type" type="gml:CodeType">
                        <annotation>
                            <documentation>A term describing the type of sensor. Intended to come from a controlled list of terms.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="measurementAxisBearing"
                        type="eml:PlaneAngleMeasure">
                        <annotation>
                            <documentation>Compass bearing direction (relative to true north)
                                defining the measurement axis direction (for directional
                                measurements, eg. component of an extensometer, accelerometer,
                                etc.)</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="measurementAxisInclination"
                        type="eml:PlaneAngleMeasure">
                        <annotation>
                            <documentation>Inclination of measurement axis (measured positively down
                                from horizontal); used for directional measurements, eg.
                                extensometer, accelerometer, etc. </documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Diggs" type="diggs:DiggsType" substitutionGroup="gml:AbstractFeature"
        abstract="false">
        <annotation>
            <documentation>Top level object of a DIGGS xml instance.</documentation>
        </annotation>
    </element>
    <simpleType name="diggsDensityOrUnitWeightUom">
        <union
            memberTypes="diggs:geotechnicalDensityUom eml:MassPerVolumeUomExt eml:ForcePerVolumeUomExt"
        />
    </simpleType>
    <simpleType name="geotechnicalMassUom">
        <restriction base="string">
            <enumeration value="slug"/>
        </restriction>
    </simpleType>
    <simpleType name="massUom">
        <union memberTypes="diggs:geotechnicalMassUom eml:MassUomExt"/>
    </simpleType>
    <complexType name="DiggsMassMeasureType">
        <simpleContent>
            <extension base="eml:AbstractMeasure">
                <attribute name="uom" type="diggs:massUom" use="required"/>
            </extension>
        </simpleContent>
    </complexType>

    <simpleType name="DimensionMeasurementTechniqueEnumType">
        <restriction base="string">
            <enumeration value="Calipers"/>
            <enumeration value="PI-tape"/>
        </restriction>
    </simpleType>
    <simpleType name="DimensionMeasurementTechniqueType">
        <union memberTypes="diggs:DimensionMeasurementTechniqueEnumType diggs:OtherNameType"/>
    </simpleType>
    <complexType name="DensityOrUnitWeightMeasureType">
        <simpleContent>
            <extension base="eml:AbstractMeasure">
                <attribute name="uom" type="diggs:diggsDensityOrUnitWeightUom" use="required"/>
            </extension>
        </simpleContent>
    </complexType>
    <simpleType name="diggsPressureUom">
        <union memberTypes="diggs:geotechnicalPressureUom eml:PressureUom"/>
    </simpleType>
    <complexType name="DiggsStringType" mixed="true">
        <simpleContent>
            <extension base="string">
                <attribute ref="xml:lang"/>
            </extension>
        </simpleContent>
    </complexType>
    <!--Removed 2/26/2017, Superceded by ParameterType for consistency with other uses DJP
  <complexType name="DiggsOtherFieldPropertiesType" mixed="true">
    <simpleContent>
      <extension base="string">
        <attribute name="propertyName" type="string" use="required"/>
      </extension>
    </simpleContent>
  </complexType>
  -->
    <complexType name="DiscontinuityObservationType">
        <annotation>
            <documentation>A discontinuity or zone of discontinuities</documentation>
        </annotation>
        <complexContent>
            <extension base="diggs:AbstractObservationType">
                <sequence>
                    <element name="fractureObservation" type="diggs:FractureObservationPropertyType"
                        minOccurs="0"/>
                    <element name="fractureSpacing" minOccurs="0"
                        type="diggs:FractureSpacingPropertyType"/>
                    <element maxOccurs="unbounded" minOccurs="0" ref="diggs:placedObservation"/>
                    <element minOccurs="0" ref="diggs:baseBoundary">
                        <annotation>
                            <documentation>Description of the boundary at the base of the observed
                                zone or interval as defined in the observation's location
                                property</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="DiscontinuityObservation" substitutionGroup="diggs:AbstractObservation"
        type="diggs:DiscontinuityObservationType">
        <annotation>
            <documentation>Descriptions of faults, fractures and joints and their spacing, with
                attendant mechanical and hydraulic properties. Individual discontinuities or zone of
                discontinuities within a discontinuity system may overlap.</documentation>
        </annotation>
    </element>
    <complexType name="DiscontinuityObservationPropertyType">
        <sequence maxOccurs="1">
            <element maxOccurs="1" ref="diggs:DiscontinuityObservation"/>
        </sequence>
    </complexType>
    <element name="DiscontinuitySystem" substitutionGroup="diggs:AbstractObservationSystem"
        type="diggs:DiscontinuitySystemType">
        <annotation>
            <documentation>An object that contains a system of discontinuity
                observations.</documentation>
        </annotation>
    </element>
    <complexType name="DiscontinuitySystemType">
        <complexContent>
            <extension base="diggs:AbstractObservationSystemType">
                <sequence>
                    <element name="discontinuityType" type="gml:CodeType">
                        <annotation>
                            <documentation>The kind of Discontinuity system described (eg. Joints).
                            </documentation>
                        </annotation>
                    </element>
                    <element name="discontinuityObservation"
                        type="diggs:DiscontinuityObservationPropertyType" maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="DocumentInformation" type="diggs:DocumentInformationType"
        substitutionGroup="diggs:AbstractComponentObjectBase" abstract="false" block=""
        nillable="false">
        <annotation>
            <documentation>An object that contains metadata about the specific xml
                instance.</documentation>
        </annotation>
    </element>
    <complexType name="DocumentInformationPropertyType">
        <sequence>
            <element minOccurs="1" maxOccurs="1" ref="diggs:DocumentInformation"/>
        </sequence>
    </complexType>
    <complexType name="DocumentInformationType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <sequence>
                        <element ref="gml:description" minOccurs="0"/>
                        <element minOccurs="0" ref="gml:identifier"/>
                    </sequence>
                    <element name="creationDate" type="gml:TimePositionType">
                        <annotation>
                            <documentation>The date that this instance file was
                                created.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="effectiveDate" type="gml:TimePositionType">
                        <annotation>
                            <documentation>The effective date for the data in this XML instance. It
                                represents the date the information within this instance document
                                was last modified and would precede the
                                creationDate.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="expirationDate" type="gml:TimePositionType">
                        <annotation>
                            <documentation>The expiration date for the data in this XML instance. It
                                represents the date when this information is no longer relevant or
                                may be superceded.</documentation>
                        </annotation>
                    </element>
                    <element name="author" type="diggs:BusinessAssociatePropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <appinfo source="urn:x-gml:targetElement">diggs:BusinessAssociate</appinfo>
                            <documentation>A property element that supports a value by reference
                                only. The target value is indicated in the appinfo
                                element.</documentation>
                        </annotation>
                    </element>
                    <element name="disclaimer" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>An uncontrolled string that identifies conditions and
                                limitations of the data included in this instance.</documentation>
                        </annotation>
                    </element>
                    <element name="sourceSoftware" type="diggs:SoftwareApplicationPropertyType"
                        minOccurs="0" maxOccurs="unbounded">
                        <annotation>
                            <documentation>If appropriate, the software that created the instance.
                            </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="destination" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>The intended destination for this XML instance; eg.
                                chris@diggsml.org or
                                ftp://uploaduser:password@ftp.diggsml.org/auto_import</documentation>
                        </annotation>
                    </element>
                    <element name="destinationSoftware" type="diggs:SoftwareApplicationPropertyType"
                        minOccurs="0" maxOccurs="unbounded">
                        <annotation>
                            <documentation>If appropriate, the software that is intended to consume
                                the file.</documentation>
                        </annotation>
                    </element>
                    <element name="auditTrail" type="diggs:RemarkPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>A series of remarks that provides a history of similar
                                xml instance transmissions. Provides a way for data providers and
                                receivers to track multiple versions of similar data transmissions.
                            </documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="DrillAdvancementArrayPropertyType">
        <sequence maxOccurs="unbounded">
            <element maxOccurs="1" minOccurs="1" ref="diggs:Advancement">
                <annotation>
                    <documentation>Data describing drilling parameters and observations while
                        advancing a section of the borehole, such as drill advancement rate, mud
                        weight, thrust and rotational speed.</documentation>
                </annotation>
            </element>
        </sequence>
        <attribute name="setName" type="string">
            <annotation>
                <documentation>A value that identifies this set of Advancement objects to account
                    for redrilling over a specific depth range. Each set of Advancement objects
                    corresponds to a single drilling event over a speciic depth range that
                    encompasses the total depth range of the set of Advancement objects. Possible
                    values for setName could be "Initial", "Redrill 1", etc.</documentation>
            </annotation>
        </attribute>
    </complexType>
    <simpleType name="EmailEnumType">
        <restriction base="string">
            <enumeration value="personal"/>
            <enumeration value="business"/>
        </restriction>
    </simpleType>
    <simpleType name="EmailStringType">
        <restriction base="string">
            <pattern value="([A-z0-9_\.\-\+])+@(([A-z0-9_\-]{2,})\.)+[A-z0-9_\-]{2,}"/>
        </restriction>
    </simpleType>
    <complexType name="EmailType">
        <simpleContent>
            <extension base="diggs:EmailStringType">
                <attribute name="type" type="diggs:ExtEmailEnumType"/>
            </extension>
        </simpleContent>
    </complexType>
    <complexType name="EnergyDensityMeasure">
        <simpleContent>
            <extension base="eml:AbstractMeasure">
                <attribute name="uom" type="diggs:energyDensityUom" use="required"/>
            </extension>
        </simpleContent>
    </complexType>
    <simpleType name="energyDensityUom">
        <restriction base="eml:UomEnum">
            <enumeration value="J/m3"/>
            <enumeration value="kJ/m3"/>
            <enumeration value="MJ/m3"/>
            <enumeration value="mJ/m3"/>
            <enumeration value="J/L"/>
            <enumeration value="kJ/L"/>
            <enumeration value="MJ/L"/>
            <enumeration value="mJ/L"/>
            <enumeration value="Wh/m3"/>
            <enumeration value="Wh/L"/>
            <enumeration value="kcal/m3"/>
            <enumeration value="kcal/L"/>
            <enumeration value="BTU/gal"/>
            <enumeration value="kWh/m3"/>
            <enumeration value="kWh/L"/>
        </restriction>
    </simpleType>
    <element name="Environment" type="diggs:EnvironmentType"
        substitutionGroup="diggs:AbstractObject" abstract="false">
        <annotation>
            <documentation>A collection of environmental parameters recorded at a specific time
                instant.</documentation>
        </annotation>
    </element>
    <complexType name="EnvironmentPropertyType">
        <sequence>
            <element ref="diggs:Environment" minOccurs="1" maxOccurs="1">
                <annotation>
                    <documentation>A collection of environmental parameters recorded at a specific
                        time instant.</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <complexType name="EnvironmentType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="dateTime" type="gml:TimePositionType"/>
                    <element name="ambientTemperature" type="eml:ThermodynamicTemperatureMeasure"
                        minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Ambient air temperature reported as a single value at the
                                time of measurement</documentation>
                        </annotation>
                    </element>
                    <element name="barometricPressure" type="diggs:pressureMeasureType"
                        minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Barometric pressure reported as a single value at the
                                time of measurement</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" maxOccurs="1" ref="diggs:gasFlow">
                        <annotation>
                            <documentation>Where environmental data of interest is within an
                                experimental chamber, a measure of the gas flow within the chamber.
                                Deprecated; use test procedure specific properties where
                                relevant.</documentation>
                        </annotation>
                    </element>
                    <element name="humidity" type="eml:VolumePerVolumeMeasure" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>Atmospheric humidity reported as a single value at the
                                time of measurement</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" maxOccurs="1" ref="diggs:gasPressure">
                        <annotation>
                            <documentation>Where environmental data of interest is within an
                                experimental chamber, a measure of the gas pressure within the
                                chamber. Deprecated; use test procedure specific properties where
                                relevant.</documentation>
                        </annotation>
                    </element>
                    <element name="weather" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>General description of the weather (eg. sunny, partly
                                cloudy, etc.)</documentation>
                        </annotation>
                    </element>
                    <element name="windSpeed" type="diggs:LengthPerTimeMeasureType" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>Wind speed reported as a single value at the time
                                measurement was taken</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="otherEnvironmentalProperty"
                        type="diggs:ParameterPropertyType" maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Equipment" type="diggs:EquipmentType" substitutionGroup="diggs:AbstractEquipment"
        abstract="false">
        <annotation>
            <documentation>Generic Equipment object, contains only the properties of the base type.
                Used where a more specialized equipment object is not needed or not
                developed.</documentation>
        </annotation>
    </element>
    <complexType name="EquipmentPropertyType">
        <sequence>
            <element ref="diggs:AbstractEquipment" maxOccurs="1" minOccurs="0"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <complexType name="EquipmentType">
        <complexContent>
            <extension base="diggs:AbstractEquipmentType"/>
        </complexContent>
    </complexType>
    <simpleType name="ExtEmailEnumType">
        <union memberTypes="diggs:OtherNameType diggs:EmailEnumType"/>
    </simpleType>
    <simpleType name="ExtPhoneEnumType">
        <union memberTypes="diggs:OtherNameType diggs:PhoneEnumType"/>
    </simpleType>
    <simpleType name="ExtQualifierEnumType">
        <union memberTypes="diggs:OtherNameType diggs:QualifierEnumType"/>
    </simpleType>
    <complexType name="FeatureReferenceType">
        <annotation>
            <documentation>This type is used to point to a DIGGS feature (by its gml:id in the
                xlink:href attribute) or by its gml:identifier (using indentifierRef
                attribute)</documentation>
        </annotation>
        <complexContent>
            <extension base="gml:ReferenceType">
                <attribute name="identifierRef" type="diggs:IdentifierReferenceType" use="optional">
                    <annotation>
                        <documentation>Provides a fully qualified gml:identifier value of the target
                            feature. Used primarily to reference a feature by a globally unique
                            identifier as opposed to the gml:id</documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <element name="LithProperties" type="diggs:LithPropertiesType">
        <annotation>
            <documentation>Soil geotechnical and geologic properties derived solely from visual/manual techniques, such as that defined in ASTM D2488.</documentation>
        </annotation>
    </element>
    <complexType name="LithPropertiesPropertyType">
        <sequence>
            <element maxOccurs="1" ref="diggs:LithProperties"/>
        </sequence>
    </complexType>
    <complexType name="LithPropertiesType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element name="remark" type="diggs:RemarkPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.</documentation>
                        </annotation>
                    </element>

                    <choice>
                        <annotation>
                            <documentation>apparentDensity is used for granular soils, consistency used for fine-grained soil. Both cannot be used in the context of a single lithology class.</documentation>
                        </annotation>
                        <element name="apparentDensity" type="gml:CodeType" minOccurs="0">
                            <annotation>
                                <documentation>A text string describing the relative density of intact coarse-grained soils. Common terms are very Loose, loose, medium dense, dense, very Dense; intended to come from a controlled list</documentation>
                            </annotation>
                        </element>
                        <element name="consistency" type="gml:CodeType" minOccurs="0">
                            <annotation>
                                <documentation>A text string describing the consistency of intact fine-grained soils. Common terms are very soft, soft, firm, hard or very hard; intended to come from a controlled list</documentation>
                            </annotation>
                        </element>
                    </choice>
                    <choice minOccurs="0">
                        <element name="beddingOrientation" type="diggs:DiggsStringType"
                            minOccurs="1">
                            <annotation>
                                <documentation>A text string describing the bedding orientationfor stratified material (eg. horizontal, inclined, inclined). If quantitative strike and or dip data is available, dipAngle and dipDirection properties instead.
</documentation>
                            </annotation>
                        </element>
                        <choice>
                            <sequence>
                                <element name="dipAngle" type="diggs:DipMeasureType"/>
                                <element minOccurs="0" name="dipDirection"
                                    type="eml:PlaneAngleMeasure"/>
                            </sequence>
                            <element minOccurs="1" name="dipDirection" type="eml:PlaneAngleMeasure"
                            />
                        </choice>
                    </choice>
                    <element name="beddingSpacing" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>For stratified material, this property records the average thickness between beds as either a descriptive term (eg. thick, thin, etc., from a controlled list of terms, or as a string representation of a numeric value (eg. 10 cm).</documentation>
                        </annotation>
                    </element>
                    <element name="cementation" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A text string describing the degree of cementation of intact coarse-grained soils. Common values are weak, moderate, or strong; intended to come from a controlled list</documentation>
                        </annotation>
                    </element>
                    <element name="dilatancy" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A text string describing the degree of dilantancy of fine grained soils. Common terms are none, slow, rapid; intended to come from a controlled list</documentation>
                        </annotation>
                    </element>
                    <element name="dryStrength" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A text string describing the degree of dry strength. common terms are none, low, medium, high, very high; intended to come from a controlled list</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="fabric" type="gml:CodeType" maxOccurs="1">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the spatial arrangement of grains, Common terms are random, oriented, imbricated, etc. Intended to come from a controlled list of terms.
I</documentation>
                        </annotation>
                    </element>
                    <element name="moistureCondition" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A text string describing the moisture of the soil, Common values are dry, moist, or wet; intended to come from a controlled list</documentation>
                        </annotation>
                    </element>
                    <element name="odor" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A text string describing the odor of the material if organic or unusual (eg. H2S); intended to come from a controlled list</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="particleAngularity" type="gml:CodeType"
                        maxOccurs="1">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the overall
angularity of coarse-grained particles. Common terms are angular, subangular, subrounded, rounded). Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="particleHardness" type="diggs:SizeClassCodeType"
                        maxOccurs="1">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the overall
                                hardness of sand and coarser particles by how the particles react to a hammer blow. Common terms are crack, fracture, or crumble. Hard is typically used if no cracking occurs. Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="particleShape" type="gml:CodeType" maxOccurs="1">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the overall
                                shape of (typically) gravel and larger particles particles. Common terms are flat, elongated, and flat and elongated. Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="particleSize" type="gml:CodeType" maxOccurs="1">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the overall particle size distribution of sand and coarser material, eg. "fine", "fine to coarse", "medium. Intended to come from a controlled list. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="particleSizeDistribution"
                        type="diggs:ParticleSizeDistributionPropertyType" maxOccurs="1">
                        <annotation>
                            <documentation>Particle size distribution information providing details such as mean grain size, maximum grain size, etc. As opposed to Properties in this object support quantitative values derived from laboratory analyses can carry descriptive terms. Detailed properties of a grain size distribution curve should be reported as test results of a ParticleSizeTest</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="particleSorting" type="gml:CodeType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                particle sorting of soil or rock particles, eg. "well-sorted". Intended to come
                                from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="plasticity" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative plasticity of fine-grained soil. Common terms are low, medium, high. Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element name="reactionToHCl" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A text string describing the soil's reaction to HCl. Common terms are none, weak, or strong; intended to come from a controlled list</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockGrainSize" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the overall
                                particle size or crystal size distribution of the rock, depending on
                                rock origin. For example, for cystalline igneous or metamorphic
                                rocks, terms such as pegmatitic or aphanitic may be used. For
                                clastic sedimentary rocks, terms such as fine sand or cobbles may be
                                used, and for pyroclastic igneous rocks, terms such as "coarse ash"
                                or "lapili" may be used. Intended to come from a controlled list of
                                terms.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockHardness" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                hardness of rock, as governed by its mineralogy, eg. "hard".
                                Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockMass" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the structural
                                features that constitute mechanical discontinuities (major
                                geological features). Rock mass refers to any in situ rock with all
                                inherent geomechanical discontinuities (eg. fissile, blocky,
                                fractured, etc.) </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockSlakingRate" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                rate of slaking of rock, eg. "slow". Intended to come from a
                                controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockStrength" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                hardness of rock, as governed by its compressive strengh, eg.
                                "strong". Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockWeathering" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                degree of rock weathering, eg. "slightly decomposed", "Grade III",
                                etc. Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="soilStructure" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                structure of intact soil. Common terms are stratified, laminated, fissured, slickensided, blocky, lensed, homogeneous, varved, etc. Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="staining" type="gml:CodeType">
                        <annotation>
                            <documentation>A term describing the source of any visible staining of the lithologic unit within the area of observation. Possible terms include iron, manganese, hydrocarbons, etc. Intended to come from a controlled list of terms.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="surfaceTexture" type="gml:CodeType" maxOccurs="1">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the microscale features on grain surfaces. Common terms include: polished, smooth, pitted, striated, etc. Intended to come from a controlled list of terms.
Includes:</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="toughness" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                toughness of fine-grained soil when kneaded near the plastic limit. Common termes are low, medium, high. Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="unitRecoveryLength" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Records the length of core recovered for this reported
                                lithologic interval. Unit recovery percent can then be computed by
                                dividing this value by the interval thickness.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="unitRQD" type="eml:LengthPerLengthMeasure">
                        <annotation>
                            <documentation>The rock quality designation for the unit, defined as the
                                unitRQDLength divided by the total unit thickness.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="unitRQDLength" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Records the length of intact pieces of rock core equal to
                                or exceeding 100 cm (4 in) in length over the lithologic
                                interval.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="otherLithProperty" maxOccurs="unbounded"
                        type="diggs:ParameterPropertyType">
                        <annotation>
                            <documentation>Used for other properties not listed in the
                                FieldProperties object. Uses name/value pairs of the Parameter
                                object. Eg. name = Additional Description, value = with
                                slag</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="FluidSpecimen" type="diggs:FluidSpecimenType"
        substitutionGroup="diggs:AbstractSpecimen">
        <annotation>
            <documentation>A specialization of a specimen that describes the physical conditions of
                a fluid sample or samples subjected to testing.</documentation>
        </annotation>
    </element>
    <complexType name="FluidSpecimenType">
        <complexContent>
            <extension base="diggs:AbstractSpecimenType">
                <sequence>
                    <element minOccurs="0" name="dilutionFactor" type="eml:UnitlessMeasure">
                        <annotation>
                            <documentation>For fluid samples that must be diluted before testing,
                                this property is defined as the total specimen volume divided by the
                                solute (orignal sample) volume</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="leachatePreparationDateTime"
                        type="gml:TimePositionType">
                        <annotation>
                            <documentation>The time when a leachate was prepared</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="leachatePreparationMethod"
                        type="diggs:SpecificationPropertyType">
                        <annotation>
                            <documentation>This property contains or points to a Specification
                                object that defines the method of leachate
                                preparation.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Flush" substitutionGroup="diggs:AbstractObject" type="diggs:FlushType"/>
    <complexType name="FlushPropertyType">
        <sequence>
            <element ref="diggs:Flush" maxOccurs="1" minOccurs="1"/>
        </sequence>
    </complexType>
    <complexType name="FlushType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element name="flushZoneLocation" type="diggs:LinearExtentPropertyType"
                        minOccurs="0">
                        <annotation>
                            <documentation>The depth interval of the flush zone, measured in a
                                linear reference system. If omitted, it is to be assumed that the
                                flushing activity pertains to the entire hole
                                length.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="fluidType" type="gml:CodeType">
                        <annotation>
                            <documentation>Type of fluid used for flushing. Intended to derive from
                                a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="minFlushReturn" type="eml:VolumePerVolumeMeasure">
                        <annotation>
                            <documentation>Percentage of fluid that returns from the hole following
                                flushing. (minimum value)</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="maxflushReturn" type="eml:VolumePerVolumeMeasure">
                        <annotation>
                            <documentation>Percentage of fluid that returns from the hole following
                                flushing. (maximum value)</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="flushColor" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>Color of the fluid return; an uncontrolled
                                string.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="forcePerTimeMeasure">
        <simpleContent>
            <extension base="eml:AbstractMeasure">
                <attribute name="uom" type="diggs:forcePerTimeUom"/>
            </extension>
        </simpleContent>
    </complexType>
    <simpleType name="forcePerTimeUom">
        <restriction base="eml:UomEnum">
            <enumeration value="Pa/sec"/>
            <enumeration value="at/sec"/>
            <enumeration value="atm/sec"/>
            <enumeration value="bar/sec"/>
            <enumeration value="cmH2O(4degC)/sec"/>
            <enumeration value="dyne/cm2/sec"/>
            <enumeration value="GPa/sec"/>
            <enumeration value="hbar/sec"/>
            <enumeration value="inH2O(39.2F)/sec"/>
            <enumeration value="inH2O(60F)/sec"/>
            <enumeration value="inHg(32F)/sec"/>
            <enumeration value="inHg(60F/sec)"/>
            <enumeration value="kgf/cm2/sec"/>
            <enumeration value="kgf/mm2/sec"/>
            <enumeration value="kN/m2/sec"/>
            <enumeration value="kPa/sec"/>
            <enumeration value="kpsi/sec"/>
            <enumeration value="lbf/ft2/sec"/>
            <enumeration value="lbf/100ft2/sec"/>
            <enumeration value="lbf/in2/sec"/>
            <enumeration value="mbar/sec"/>
            <enumeration value="mmHg(0C)/sec"/>
            <enumeration value="mPa/sec"/>
            <enumeration value="MPa/sec"/>
            <enumeration value="Mpsi/sec"/>
            <enumeration value="N/m2/sec"/>
            <enumeration value="N/mm2/sec"/>
            <enumeration value="Pa(g)/sec"/>
            <enumeration value="pPa/sec"/>
            <enumeration value="psi/sec"/>
            <enumeration value="psia/sec"/>
            <enumeration value="psig/sec"/>
            <enumeration value="tonfUS/ft2/sec"/>
            <enumeration value="tonfUS/in2/sec"/>
            <enumeration value="torr/sec"/>
            <enumeration value="ubar/sec"/>
            <enumeration value="umHg(0C)/sec"/>
            <enumeration value="uPa/sec"/>
            <enumeration value="upsi/sec"/>

        </restriction>
    </simpleType>
    <simpleType name="FractionEnumType">
        <restriction base="string">
            <enumeration value="Bed Sediment"/>
            <enumeration value="Dissolved"/>
            <enumeration value="Free Available"/>
            <enumeration value="Non-filterable"/>
            <enumeration value="Non-settleable"/>
            <enumeration value="Recoverable"/>
            <enumeration value="Suspended"/>
            <enumeration value="Total"/>
            <enumeration value="Total Residual"/>
            <enumeration value="Vapor"/>
        </restriction>
    </simpleType>
    <complexType name="FractionalReferenceType">
        <complexContent>
            <extension base="diggs:FeatureReferenceType">
                <attribute name="percentage" type="diggs:Val0-100Type" use="optional"/>
            </extension>
        </complexContent>
    </complexType>
    <element name="FractureObservation" type="diggs:FractureObservationType">
        <annotation>
            <documentation>An object containing properties of a fracture
                observation.</documentation>
        </annotation>
    </element>
    <complexType name="FractureObservationPropertyType">
        <sequence>
            <element ref="diggs:FractureObservation"/>
        </sequence>
    </complexType>
    <complexType name="FractureObservationType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="aperatureMeasurement" type="eml:LengthMeasure">
                        <annotation>
                            <documentation><![CDATA[Discontinuity aperture measurement]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="aperatureObservation" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation><![CDATA[Discontinuity aperture observation]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="dipAngle" type="diggs:DipMeasureType">
                        <annotation>
                            <documentation><![CDATA[Dip of discontinuity]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="dipDirection" type="eml:PlaneAngleMeasure">
                        <annotation>
                            <documentation><![CDATA[Dip direction of discontinuity]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="discontinuityNumber" type="integer">
                        <annotation>
                            <documentation><![CDATA[Discontinuity number]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="fractureSetNumber" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation><![CDATA[Discontinuity set reference number]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="infillMaterial" type="gml:CodeType">
                        <annotation>
                            <documentation><![CDATA[Infilling material]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="infillHardness" type="gml:CodeType">
                        <annotation>
                            <documentation>Hardness of the infill material</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="jointRoughnessCoefficient" type="double">
                        <annotation>
                            <documentation><![CDATA[Joint Roughness Coefficient]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="persistence" type="double">
                        <annotation>
                            <documentation><![CDATA[Persistence measurement]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="planarity" type="gml:CodeType">
                        <annotation>
                            <documentation><![CDATA[Intermediate scale planarity (ISRM 1978)]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="roughness" type="gml:CodeType">
                        <annotation>
                            <documentation><![CDATA[Small scale roughness (ISRM 1978)]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="seepageRating" type="gml:CodeType">
                        <annotation>
                            <documentation><![CDATA[Seepage rating (ISRM 1978)]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="surfaceAppearance" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation><![CDATA[Surface appearance]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="termination" type="gml:CodeType">
                        <annotation>
                            <documentation><![CDATA[Discontinuity termination (lower, upper) (ISRM 1978)]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="type" type="gml:CodeType">
                        <annotation>
                            <documentation><![CDATA[Type of discontinuity]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="wallStrength" type="eml:PressureMeasure">
                        <annotation>
                            <documentation><![CDATA[Discontinuity wall strength]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="wallWeathering" type="gml:CodeType">
                        <annotation>
                            <documentation><![CDATA[Discontinuity wall weathering]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="fractureHealing" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>A description of fracture healing or the state of healed fractures in rock. These might include mineral filling/mineralization (eg. crystallization, precipitation), physical charactceristics (eg. cementation, recrystallization), quality descriptors (eg. partial healing, etc.) and age/time of healing (eg. ancient, recent).</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="waterFlow" type="eml:VolumePerTimeMeasure">
                        <annotation>
                            <documentation><![CDATA[Water flow estimate]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="wavinessAmplitude" type="eml:LengthMeasure">
                        <annotation>
                            <documentation><![CDATA[Large scale waviness, amplitude (ISRM 1978)]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="wavinessWavelength" type="eml:LengthMeasure">
                        <annotation>
                            <documentation><![CDATA[Large scale waviness, wavelength (ISRM 1978)]]></documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute name="howDetermined" type="diggs:DescriptorMethodEnumType">
                    <annotation>
                        <documentation>A value that describes the method by which the observation or measurement
                            was determined. </documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <element name="FractureSpacing" type="diggs:FractureSpacingType">
        <annotation>
            <documentation>An object containing properties describing the spacing between
                fractures.</documentation>
        </annotation>
    </element>
    <complexType name="FractureSpacingPropertyType">
        <sequence>
            <element ref="diggs:FractureSpacing"/>
        </sequence>
    </complexType>
    <complexType name="FractureSpacingType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence minOccurs="1">
                    <element minOccurs="0" name="minSpacing" type="eml:LengthMeasure">
                        <annotation>
                            <documentation><![CDATA[Minimum Fracture Spacing over zone]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="maxSpacing" type="eml:LengthMeasure">
                        <annotation>
                            <documentation><![CDATA[Maximum Fracture Spacing over zone]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="averageSpacing" type="eml:LengthMeasure">
                        <annotation>
                            <documentation><![CDATA[Average Fracture Spacing over zone]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="fractureCount" type="positiveInteger">
                        <annotation>
                            <documentation>The number of fractures identified within the extent of the DiscontinuityObservation.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="fracturesPerUnitLength"
                        type="eml:ReciprocalLengthMeasureExt">
                        <annotation>
                            <documentation><![CDATA[Number of fractures per unit length as specified in the uom attribute. This is a property included for compatibility with an AGS field but should generally not be otherwise used, as it is borehole specific and can be calculated from fractureCount and the length of the LinearExtent reported for the DiscontinuityObservation]]></documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <simpleType name="geotechnicalDensityUom">
        <restriction base="eml:UomEnum">
            <enumeration value="kN/m3">
                <annotation>
                    <documentation>kilo-Newton per cubic meter</documentation>
                </annotation>
            </enumeration>
            <enumeration value="klbf/ft3">
                <annotation>
                    <documentation>Thousand pound-force (kips) per cubic foot</documentation>
                </annotation>
            </enumeration>
            <enumeration value="slug/ft3">
                <annotation>
                    <documentation>Slugs (mass) per cubic foot</documentation>
                </annotation>
            </enumeration>
        </restriction>
    </simpleType>
    <simpleType name="geotechnicalPressureUom">
        <restriction base="string">
            <enumeration value="ksf"/>
            <enumeration value="ftH2O(39.2F)"/>
            <enumeration value="ftH2O(60F)"/>
            <enumeration value="inH2O(4degC)"/>
            <enumeration value="tonfUS/ft2"/>
            <enumeration value="lbf/in2"/>
        </restriction>
    </simpleType>
    <complexType name="ObservationPropertyType">
        <sequence>
            <element ref="diggs:AbstractObservation"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <element name="GroupGroup" substitutionGroup="diggs:AbstractGroup" type="diggs:GroupGroupType">
        <annotation>
            <documentation>A Diggs feature containing references to a group of
                groups.</documentation>
        </annotation>
    </element>
    <complexType name="GroupGroupType">
        <complexContent>
            <extension base="diggs:AbstractGroupType">
                <choice>
                    <element maxOccurs="unbounded" ref="diggs:groupRef" minOccurs="1"/>
                </choice>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="GroupPropertyType">
        <sequence>
            <element ref="diggs:AbstractGroup" minOccurs="1" maxOccurs="1"/>
        </sequence>
    </complexType>
    <element name="groupRef" type="diggs:FeatureReferenceType">
        <annotation>
            <appinfo source="urn:x-gml:targetElement">Diggs:AbstractGroup</appinfo>
            <documentation>A reference to a group that is associated with this feature. </documentation>
            <documentation>A property element that supports a value by reference only. The target
                value is indicated in the appinfo element.</documentation>
        </annotation>
    </element>
    <simpleType name="IdentifierReferenceType">
        <annotation>
            <documentation>Provides a reference to the gml:identifier value, which follows a pattern
                restriction conforming to the urn structure of identifiers</documentation>
        </annotation>
        <restriction base="string">
            <pattern value="urn:diggs:def:fi:[A-Z]{1,8}:[A-z0-9_\.\-]{1,200}"/>
        </restriction>
    </simpleType>
    <element name="InSituTestEvent" type="diggs:InSituTestEventType"
        substitutionGroup="diggs:AbstractEvent">
        <annotation>
            <documentation>An object detailing a time or location-based event that may occur during
                an in-situ test.</documentation>
        </annotation>
    </element>
    <complexType name="InSituTestEventPropertyType">
        <sequence>
            <element ref="diggs:AbstractEvent"/>
        </sequence>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
    </complexType>
    <complexType name="InSituTestEventType">
        <complexContent>
            <extension base="diggs:AbstractEventType">
                <sequence/>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="false" name="LaboratoryTestEvent" substitutionGroup="diggs:AbstractEvent"
        type="diggs:LaboratoryTestEventType">
        <annotation>
            <documentation>An object that records events observed during a laboratory test. This
                object is a concrete representation of AbstractEvent with no additional
                properties.</documentation>
        </annotation>
    </element>
    <complexType name="LaboratoryTestEventPropertyType">
        <sequence>
            <element ref="diggs:LaboratoryTestEvent"/>
        </sequence>
    </complexType>
    <complexType name="LaboratoryTestEventType">
        <complexContent>
            <restriction base="diggs:AbstractEventType">
                <sequence>
                    <element minOccurs="0" ref="gml:description"/>
                    <element minOccurs="0" ref="gml:identifier"/>
                    <element maxOccurs="unbounded" minOccurs="0" ref="gml:name"/>
                    <element minOccurs="0" ref="diggs:status">
                        <annotation>
                            <documentation>A text string to provide information about the status of
                                the object to be used to track QA/QC controls, review or release
                                status, etc. The values used are intended to come from a controlled
                                list of terms maintained by an organization.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="remark"
                        type="diggs:RemarkPropertyType">
                        <annotation>
                            <documentation>Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="time" type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>Date/time when this event information was
                                recorded</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="infoRecorded"
                        type="diggs:ParameterPropertyType">
                        <annotation>
                            <documentation><![CDATA[Other associated data measured or observed at this time]]></documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute ref="gml:id" use="required"/>
                <attribute ref="xml:lang">
                    <annotation>
                        <documentation>Identifies the language used for the values of properties in
                            this feature. Optional; if not used language is assumed to be
                            English.</documentation>
                    </annotation>
                </attribute>
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="InstallationEventPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:InstallationEvent"/>
        </sequence>
    </complexType>
    <element name="InstallationEvent" type="diggs:InstallationEventType">
        <annotation>
            <documentation>An object that contains properties about a time or depth related event
                occurring in association with creation of an installation feature.</documentation>
        </annotation>
    </element>
    <complexType name="InstallationEventType">
        <complexContent>
            <extension base="diggs:AbstractEventType">
                <sequence/>
            </extension>
        </complexContent>
    </complexType>
    <element name="IntactSpecimenPreparationInfo" type="diggs:IntactSpecimenPreparationInfoType"
        substitutionGroup="diggs:AbstractObject">
        <annotation>
            <documentation>An object containing properties of an intact specimen.</documentation>
        </annotation>
    </element>
    <complexType name="IntactSpecimenPreparationInfoPropertyType">
        <sequence>
            <element ref="diggs:IntactSpecimenPreparationInfo"/>
        </sequence>
    </complexType>
    <complexType name="IntactSpecimenPreparationInfoType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="IntactSpecimenType"
                        type="diggs:IntactSpecimenTypeType"/>
                    <element minOccurs="0" name="specimenTrimmedInWetRoom" type="boolean">
                        <annotation>
                            <documentation>For trimmed intact specimens, true if trimming occurs in
                                a wet room.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <simpleType name="IntactSpecimenTypeEnumType">
        <restriction base="string">
            <enumeration value="extruded"/>
            <enumeration value="sub-sampled"/>
            <enumeration value="trimmed">
                <annotation>
                    <documentation>Short integer data value.</documentation>
                </annotation>
            </enumeration>
        </restriction>
    </simpleType>
    <simpleType name="IntactSpecimenTypeType">
        <union memberTypes="diggs:IntactSpecimenTypeEnumType diggs:OtherNameType"/>
    </simpleType>
    <simpleType name="dataTypeEnumType">
        <annotation>
            <documentation/>
        </annotation>
        <restriction base="string">
            <enumeration value="anyURI"/>
            <enumeration value="base64binary"/>
            <enumeration value="byte"/>
            <enumeration value="date"/>
            <enumeration value="dateTime">
                <annotation>
                    <documentation>Date with time.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="decimal"/>
            <enumeration value="duration"/>
            <enumeration value="gDay"/>
            <enumeration value="gMonth"/>
            <enumeration value="gMonthDay"/>
            <enumeration value="gYear"/>
            <enumeration value="gYearMonth"/>
            <enumeration value="hexBinary"/>
            <enumeration value="integer"/>
            <enumeration value="language"/>
            <enumeration value="negativeInteger"/>
            <enumeration value="nonNegativeInteger"/>
            <enumeration value="nonPositiveInteger"/>
            <enumeration value="normalizedString"/>
            <enumeration value="positiveInteger"/>
            <enumeration value="short"/>
            <enumeration value="time"/>
            <enumeration value="token"/>
            <enumeration value="unsignedByte"/>
            <enumeration value="unsignedShort"/>
            <enumeration value="boolean">
                <annotation>
                    <documentation>True or false values.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="bytes">
                <annotation>
                    <documentation>Integer data value (nominally a one-byte value). The value must conform to the format of the xsd:dateTime data type (minInclusive=-128 and maxInclusive=127).</documentation>
                </annotation>
            </enumeration>
            <enumeration value="double">
                <annotation>
                    <documentation>Double-precision floating-point value (nominally an 8-byte value). The value must conform to the format of the xsd:double data type.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="float">
                <annotation>
                    <documentation>Single-precision floating-point value (nominally a 4-byte value). The value must conform to the format of the xsd:float data type</documentation>
                </annotation>
            </enumeration>
            <enumeration value="int">
                <annotation>
                    <documentation>Integer data value (nominally a 4-byte value). The value must conform to the format of the xsd:int data type.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="long">
                <annotation>
                    <documentation>Long integer data value (nominally an 8-byte value). The value must conform to the format of the xsd:long data type.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="null">
                <annotation>
                    <documentation>No value or the value is null.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="string">
                <annotation>
                    <documentation>Character string data. The value must conform to the format of the xsd:string data type. The maximum length of a value is determined by individual servers. </documentation>
                </annotation>
            </enumeration>
            <enumeration value="vector">
                <annotation>
                    <documentation>An array of doubles.</documentation>
                </annotation>
            </enumeration>
        </restriction>
    </simpleType>
    <element name="investigationTarget" type="diggs:investigationTargetEnumExtType">
        <annotation>
            <documentation>A description of the target of the investigation for this feature. It can
                include a feature of interest for an exploratory investigation, or the type of
                feature that an activity is performed on. The values derive from a controlled list
                of terms that can be modified by prefacing the term with "Other:".</documentation>
        </annotation>
    </element>
    <simpleType name="investigationTargetEnumType">
        <annotation>
            <documentation>A controlled list that indicates the target being investigated by this
                feature: Deep Foundation - investigation of deep foundation elements. Earthworks -
                earth materials excavated and/or emplaced by engineering activity. Ground
                Improvement - activities designed to alter the characterstics of natural ground.
                Ground Water - hydrology and chemistry of ground water. Indoor Atmosphere -
                meteorology and chemistry of air in indoor spaces. Material Sample - a sample of
                material not derived from other enumerations in this list. Natural Ground - earth
                materials sampled in natural or undisturbed state. Outdoor Atmosphere - meteorology
                and chemistry of air in outdoor spaces. Surface Water - hydrology and chemistry of
                surface water. </documentation>
        </annotation>
        <restriction>
            <simpleType>
                <restriction base="string">
                    <enumeration value="Deep Foundation"/>
                    <enumeration value="Earthworks"/>
                    <enumeration value="Ground Improvement"/>
                    <enumeration value="Ground Water"/>
                    <enumeration value="Indoor Atmosphere"/>
                    <enumeration value="Material Sample"/>
                    <enumeration value="Natural Ground"/>
                    <enumeration value="Outdoor Atmosphere"/>
                    <enumeration value="Pipeline"/>
                    <enumeration value="Surface Water"/>
                </restriction>
            </simpleType>
            <whiteSpace value="preserve"/>
        </restriction>
    </simpleType>
    <simpleType name="investigationTargetEnumExtType">
        <annotation>
            <documentation>A controlled list that indicates the target being investigated by this
                feature (feature of interest): Deep Foundation - investigation of deep foundation
                elements. Earthworks - earth materials excavated and/or emplaced by engineering
                activity. Ground Improvement - observations of and activities designed to alter the
                characterstics of natural ground. Ground Water - hydrology and chemistry of ground
                water. Indoor Atmosphere - meteorology and chemistry of air in indoor spaces.
                Natural Ground - earth materials sampled in natural or undisturbed state. Outdoor
                Atmosphere - meteorology and chemistry of air in outdoor spaces. Surface Water -
                hydrology and chemistry of surface water. Other terms can be used by prefacing the
                term with "Other:"</documentation>
        </annotation>
        <union memberTypes="diggs:investigationTargetEnumType diggs:OtherNameType"/>
    </simpleType>
    <complexType name="LaboratoryProcedurePropertyType">
        <sequence>
            <element ref="diggs:AbstractLaboratoryTestProcedure"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <element abstract="false" name="Limit" substitutionGroup="gml:AbstractGML"
        type="diggs:LimitType">
        <annotation>
            <documentation>An object containing properties of the detection limits of a
                measurement.</documentation>
        </annotation>
    </element>
    <simpleType name="LimitEnumType">
        <union memberTypes="diggs:OtherNameType diggs:QualifierEnumType"/>
    </simpleType>
    <complexType name="LimitPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:Limit"/>
        </sequence>
    </complexType>
    <complexType name="LimitType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element maxOccurs="1" minOccurs="0" name="constraint" type="gml:CodeType">
                        <annotation>
                            <documentation>The constraint defines a condition under which the limit
                                applies</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="limitType" type="diggs:LimitEnumType">
                        <annotation>
                            <documentation>A controlled list of terms that decribe the type of limit
                                reported. Allowable values are: upper lower method quantification
                                reporting minimum allowable value maximum allowable
                                value</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="value" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>The value of the limit. </documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="LinearExtent" substitutionGroup="diggs:AbstractGeometricPrimitive"
        type="diggs:LineStringType">
        <annotation>
            <documentation>An object that defines a location as a linear extent or interval, with
                the first vertex representing the starting location and the last vertex the end
                location.</documentation>
        </annotation>
    </element>
    <complexType name="LinearExtentPropertyType">
        <complexContent>
            <restriction base="gml:DomainSetType">
                <sequence minOccurs="0">
                    <choice>
                        <element ref="diggs:LinearExtent"/>
                        <!--
DSB: REMOVED FROM PROFILE
        <element ref="gml:AbstractTimeObject"/>
        
-->
                    </choice>
                </sequence>
                <attributeGroup ref="gml:OwnershipAttributeGroup"/>
                <attributeGroup ref="gml:AssociationAttributeGroup"/>
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="MultiPointPropertyType">
        <complexContent>
            <restriction base="gml:DomainSetType">
                <sequence minOccurs="0">
                    <choice>
                        <element ref="diggs:MultiPointLocation"/>
                        <!--
DSB: REMOVED FROM PROFILE
        <element ref="gml:AbstractTimeObject"/>
        
-->
                    </choice>
                </sequence>
                <attributeGroup ref="gml:OwnershipAttributeGroup"/>
                <attributeGroup ref="gml:AssociationAttributeGroup"/>
            </restriction>
        </complexContent>
    </complexType>
    <element name="LinearSpatialReferenceSystem" type="diggs:LinearSpatialReferenceSystemType"
        substitutionGroup="diggs:AbstractRelativeReferenceSystem">
        <annotation>
            <documentation>An object describing the linear spatial reference system for a sampling
                feature.</documentation>
        </annotation>
    </element>
    <complexType name="LinearSpatialReferenceSystemPropertyType">
        <sequence>
            <element ref="diggs:LinearSpatialReferenceSystem"/>
        </sequence>
    </complexType>
    <complexType name="LinearSpatialReferenceSystemType">
        <complexContent>
            <extension base="diggs:AbstractRelativeReferenceSystemType">
                <sequence>
                    <element minOccurs="0" name="linearReferencingMethodUncertainty"
                        type="diggs:UncertaintyPropertyType">
                        <annotation>
                            <documentation>Provides accuracy value (usually a length measure) for
                                the location (geometry) elements that use this linear reference
                                system for their SRS. For example, for depths in a hole, this
                                property could provide information as to the source and accuracy of
                                depth values that relate to this reference system. If individual
                                elements that refer to this reference system have different
                                uncertainties, those uncertainties are reported within those
                                elements themselves.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="LineStringType">
        <complexContent>
            <extension base="diggs:AbstractCurveType">
                <sequence>
                    <choice>
                        <element ref="gml:posList"/>
                        <!--DSB restricted from profile
            <element ref="gml:coordinates"/>
            -->
                    </choice>
                    <element minOccurs="0" name="datumReference" type="eml:WellboreDatumReference">
                        <annotation>
                            <documentation>The type of local or permanent reference datum for
                                vertical gravity based (i.e., elevation and vertical depth) and
                                measured depth coordinates within the context of a borehole or well.
                                Adopts terminology from eml:WellBoreDatumReference.The datum is
                                aassociated with the origin (first point) of the linear
                                extent.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="uncertainty"
                        type="diggs:LocationUncertaintyPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Lithology" type="diggs:LithologyType"
        substitutionGroup="diggs:AbstractComponentObject">
        <annotation>
            <documentation>An object containing the properties of a lithology
                description.</documentation>
        </annotation>
    </element>
    <simpleType name="LithologyCharacterEnumType">
        <restriction base="string">
            <enumeration value="disseminated">
                <annotation>
                    <documentation>This lithology is uniformly distributed as a component that serves to classify the primary lithology, such as sand within a sandy clay primary lithology</documentation>
                </annotation>
            </enumeration>
            <enumeration value="interbedded">
                <annotation>
                    <documentation>This lithology is interbedded within the primary lithology</documentation>
                </annotation>
            </enumeration>
            <enumeration value="inclusions">
                <annotation>
                    <documentation>This lithology is contained in discrete masses within the primary lithology</documentation>
                </annotation>
            </enumeration>
        </restriction>
    </simpleType>
    <simpleType name="LithologyCharacterEnumExtType">
        <union memberTypes="diggs:LithologyCharacterEnumType diggs:OtherNameType"/>
    </simpleType>
    <element name="LithologyObservation" substitutionGroup="diggs:AbstractObservation"
        type="diggs:LithologyObservationType">
        <annotation>
            <documentation>An object containing properties of a lithology observation that includes
                the geometric bounds of the observations (eg. an interval of a borehole, polygon
                representation (on maps or cross-section), or 3D volume, properties of the primary
                and any component lithologies, any ancillary observations as descriptions that are
                made within the bounds of the lithology observations (placedObservation) and the
                conditions that mark the basal boundary of the lithology described.</documentation>
        </annotation>
    </element>
    <complexType name="LithologyObservationPropertyType">
        <sequence maxOccurs="1">
            <element maxOccurs="1" ref="diggs:LithologyObservation"/>
        </sequence>
    </complexType>
    <complexType name="LithologyObservationType">
        <complexContent>
            <extension base="diggs:AbstractObservationType">
                <sequence>
                    <element name="primaryLithology" type="diggs:LithologyPropertyType">
                        <annotation>
                            <documentation>A description of the lithologies that make up the principal portion of the overall lithologic classification of the
observed zone or sample,</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="componentLithology"
                        type="diggs:ComponentLithologyPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>A description of the lithology that makes up a
subsidiary portion of the overall observed zone or sample.This property would be used where the lithology is observed to be distinct from the primary lithology, for example where a zone is interbedded or the component lithology occurs in inclusions or in a specific part of the zone but is otherwise not separated out, This property can also be used in soil descriptions, where lithologic components such as sand, gravel and fines where specific details about the components (eg. silty sand with gravel) are recorded and therefore the use of the constituent property is not sufficient.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="facies" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>In reference to unconsolidated soils or sedimentary
                                rocks, this property describes certain conditions of sedimentation
                                that reflect a particular process or depositional environment. Some
                                examples might be alluvium, dune sand, river terrace deposits,
                                hemipelagic sediment, etc. Facies designations do not imply any
                                order within a stratigraphic column. Facies terms used to define
                                informal geologic units that occur in stratigraphic order (eg. units
                                do not repeat within a stratigraphic column) should be reported in a
                                StratigraphySystem. For metamorphic rocks, this property is used to
                                describe a set of mineral assemblages that form under similar
                                pressures and temperatures (eg. zeolite facies, blueschist
                                facies).</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="unitName" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>A formal or informal name for the geologic or geotechnical unit associated with this lithology observation. An uncontrolled string, examples might be "Unit A" "Merrit Sand" "Bay Mud", etc. This property would be used in cases where a StratigraphySystem or GeoUnitSystem</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" ref="diggs:placedObservation"/>
                    <element minOccurs="0" ref="diggs:baseBoundary" maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="placedObservation" type="diggs:PlacedObservationPropertyType">
        <annotation>
            <documentation/>
        </annotation>
    </element>
    <element name="PlacedObservation" substitutionGroup="diggs:AbstractComponentObjectBase"
        type="diggs:PlacedObservationType">
        <annotation>
            <documentation>A component object that identifies an observation (as a text string) that
                is assigned to a geographic location. This object is used to locate general
                observations within a Observation object of an ObservationSystem</documentation>
        </annotation>
    </element>
    <complexType name="PlacedObservationPropertyType">
        <sequence maxOccurs="1">
            <element maxOccurs="1" ref="diggs:PlacedObservation"/>
        </sequence>
    </complexType>
    <complexType name="PlacedObservationType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element ref="diggs:location"/>
                    <element minOccurs="1" name="observation" type="diggs:DiggsStringType"
                        maxOccurs="1">
                        <annotation>
                            <documentation>A description of the lithologies that make up a
                                subsidiary portion of the overall lithologic classification of the
                                layer or sample, or exist as specific components of the
                                primarylithology property</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="LithologyPropertyType">
        <sequence>
            <element ref="diggs:Lithology">
                <annotation>
                    <documentation>A term that provides description of rocks and soils on the basis
                        of such characteristics as color, mineralogic composition, and grain size or
                        other physical properties. This object holds properties to encode these
                        characteristics as both descriptions and in a controlled manner that allows
                        for machine parsing of the soil or rock characteristics</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <element name="LithologySystem" substitutionGroup="diggs:AbstractObservationSystem"
        type="diggs:LithologySystemType">
        <annotation>
            <documentation>A property containing a system of lithology observations.</documentation>
        </annotation>
    </element>
    <complexType name="LithologySystemType">
        <complexContent>
            <extension base="diggs:AbstractObservationSystemType">
                <sequence>
                    <element name="lithologyClassificationType" type="gml:CodeType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Describes the classification system(s) used to define the
                                lithology classification codes (eg. USCS) used within this
                                system</documentation>
                        </annotation>
                    </element>
                    <element name="lithologyObservation"
                        type="diggs:LithologyObservationPropertyType" maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="LithologyType" mixed="false">
        <annotation>
            <documentation/>
        </annotation>
        <complexContent>
            <extension base="diggs:ComponentObjectNoDescriptionType">
                <sequence>
                    <choice>
                        <sequence>
                            <element name="classificationCode" type="diggs:DescriptorCodeType"
                                minOccurs="1" maxOccurs="1">
                                <annotation>
                                    <documentation>The value that describes the lithology as a controlled term (classification code or controlled name), rather than a simply descriptive one. Examples:

1) For soils described using the Unified Soil Classification, this value shall be the "group name", including any modifiers as defined in Figures 1,2 and 3 of ASTM D2487 or Figures 1 and 2 of ASTM D2488, eg "Silty sand" or "Gravelly silt with sand". Where only the group symbol is reported, the unmodifed group name for the symbol should be used, as shown in Table 1 of ASTM D2487.

2) For soils described using the AASHTO soil classification system, this value should be the group or subgroup classification (eg. "A-3", "A-2-6"). 

3) For soils classified using the USDA, Shepard (1954), or Folk classifications based on soil textures, this value would be the full-text textural classification, eg. "sandy loam" (USDA), "sand-silt-clay" (Shepard), or "muddy Sand" (Folk).

4) For soils classified using the British Soil Classification System, this value would be the recommended name (eg. "CLAY of very high plasticity"), or the group symbol if the standard name is not given (eg. "CV").

5) For rock, for example as defined by the American Geosciences Institute (AGI) glossary, this value would be the rock name (eg. "Dolostone", "Basalt", "Pebbly mudstone", etc.). 

Either a classificationCode value or lithDescription value must be present in the Lithology object. 

The codespace attribute should be a URL to an xml dictionary that conforms to the GML Dictionary.xsd and DIGGSDictionary_diggs.xsd schemas and that defines the terms used in the classification system within diggs:Definition elements. The value of classificationCode should be equivalent to a gml:name property of the associated diggs:Definition, for example: <![CDATA[
    <classificationCode codespace="https://diggsml.org/def/codes/DIGGS/0.1/astmD2488.xml#SWg">Well-graded sand with gravel</classificationCode>]]> An example diggs:Definition element within the dictionary would look as follows:<![CDATA[

        <diggs:Definition gml:id="SWg">
            <gml:description>SW with ≥ 15% gravel</gml:description>
            <gml:identifier codeSpace="https://diggsml.org/def/authorities.xml#DIGGS">https://diggsml.org/def/codes/DIGGS/0.1/astmD2487.xml#SWg</gml:identifier>
            <gml:name>Well-graded sand with gravel</gml:name>
            <diggs:dataType>string</diggs:dataType>
            <diggs:authority>ASTM D2487</diggs:authority>
            <diggs:reference>https://www.astm.org/d2487-17.html</diggs:reference>
            <diggs:occurrences>
                <diggs:Occurrence>
                    <diggs:sourceElementXpath>//diggs:Lithology/diggs:classificationCode</diggs:sourceElementXpath>
                </diggs:Occurrence>
            </diggs:occurrences>
        </diggs:Definition>]]>
        
The Geo-Institute has developed online dictionaries for ASTM D2487, ASTM D2488, AASHTO and USDA classification systems that should be referenced in instance documents that use those classifications.
 
Classification systems that do not have an online dictionary may be used, but the codeSpace attribute should be a URL to an online resource for the classification system rather than an uncontrolled string value. Such usage may limit interoperability and is not recommended - a dictionary should be developed for these cases.</documentation>
                                </annotation>
                            </element>
                            <element minOccurs="0" name="lithDescription"
                                type="diggs:DescriptorType">
                                <annotation>
                                    <documentation>This property provides descriptive information
                                        about the lithology and should be use in conjunction with
                                        classificationCode. If the information is recorded,
                                        lithDescription include a description of color,facies, grain
                                        size disctribution, constituents and field properties, even
                                        if those properties are not specifically encoded (eg.
                                        well-graded sand (SW), fine-grained, dark grey, massive,
                                        dry, hard). If the lithology description does not include
                                        any controlled term that serves to classify it, then
                                        lithDescription must be used instead of classificationCode,
                                        i.e., either classificationCode or lithDescription must
                                        contain a value (although both may contain values and is
                                        preferred). </documentation>
                                </annotation>
                            </element>
                        </sequence>
                        <sequence>
                            <element minOccurs="1" name="lithDescription"
                                type="diggs:DescriptorType">
                                <annotation>
                                    <documentation>This property provides descriptive information
                                        about the lithology and should be use in conjunction with
                                        classificationCode. If the information is recorded,
                                        lithDescription include a description of color,facies, grain
                                        size disctribution, constituents and field properties, even
                                        if those properties are not specifically encoded (eg.
                                        well-graded sand (SW), fine-grained, dark grey, massive,
                                        dry, hard). If the lithology description does not include
                                        any controlled term that serves to classify it, then
                                        lithDescription must be used instead of classificationCode,
                                        i.e., either classificationCode or lithDescription must
                                        contain a value (although both may contain values and is
                                        preferred). </documentation>
                                </annotation>
                            </element>
                        </sequence>
                    </choice>
                    <element minOccurs="0" name="classificationSymbol" maxOccurs="1"
                        type="gml:CodeType">
                        <annotation>
                            <documentation>For USCS, AASHTO or BSCS soil classification
                                        systems, this property holds the group symbol (for USCS) or
                                        the group or appropriate subgroup classification (for AASHTO
                                        and BSCS). Symbology for nan-standard or proprietary
                                        classifications may also be reported here. Codespace
                                        attribute is mandatory and should preferably a link to the
                                        associated DIGGS dictionary, or be either USCS, AASHTO, or
                                        BSCS for those systems, or an authority code for
                                        non-standard systems.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="groupIndexAASHTO" type="positiveInteger">
                        <annotation>
                            <documentation>For soils classified using the AASHTO system,
                                        this property holds the value of the group index (GI) as
                                        defined by: GI= (F–35)[0.2+0.005(LL– 40)}+(F–15)(PI–10)
                                        where F is the percentage passing the 75 μm (0.075 mm)
                                        sieve, expressed as a whole number, LL is the
                                        liquid limit and PI is the plasticity index.
                                    </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="legendCode" type="diggs:LegendCodeType">
                        <annotation>
                            <documentation>A value used to define a graphic pattern that may be used to symbolize the lithology on a borehole log or map. The value can be optionally associated with an authority or dictionary using the codeSpace attribute and may also point to a specific graphic file using the xlink:href and mimeType attributes that contains the pattern named by the value of legendCode.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="matrixType" type="diggs:MatrixEnumType">
                        <annotation>
                            <documentation>Specifies the engineering characteristics of the
                                lithology matrix, either soil, rock or solid organic matter. This property
                                can typically be inferred from the classificationCode, but is
                                included here to simplify data ingestion into data systems that may
                                store rock and soil physical property information in different
                                objects or tables.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" name="color" type="diggs:ColorPropertyType"
                        minOccurs="0">
                        <annotation>
                            <documentation>A color whose boundaries match those of the lithology
                                observation should be encoded in the enclosed Color object. If there
                                are depth-specific changes in color taht are significant and do not
                                match the boundaries of the lithologyObservation, then a ColorSystem
                                can be defined to represent those data instead of encoding separate
                                lithologyObservations to record only changes in color. Also,
                                ancillary color changes in color within a lithologyObservation can
                                be added as a description only within a
                                PlacedObservation.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="constituent" type="diggs:ConstituentPropertyType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Constituents are materials and structures associated with
                                this lithology, but not considered significant enough to record as
                                part of a ConstituentSystem, or where location within a lithology
                                observation is not important to preserve (except as a comment).
                                Constituents of a lithology are descriptions that generally fall
                                into one of the following classes: 1) types of sedimentary or
                                physical structures, 2) types of lithologic, mineralogic or organic
                                accessories (eg. presence of calcite, gas odor, etc.), 3) types and
                                degree of bioturbation features, 4) types of diagenetic structures,
                                5) types of physical structures produced by sampling, 6) types of
                                fossils, 7) types of trace fossils, 8) types of
                                fractures</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="lithProperties"
                        type="diggs:LithPropertiesPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="ComponentLithPropertyType">
        <sequence>
            <element ref="diggs:ComponentLith"/>
        </sequence>
    </complexType>
    <complexType name="ComponentLithType" mixed="false">
        <annotation>
            <documentation/>
        </annotation>
        <complexContent>
            <extension base="diggs:ComponentObjectNoDescriptionType">
                <sequence>
                    <choice>
                        <sequence>
                            <element name="classificationCode" type="diggs:DescriptorCodeType"
                                minOccurs="1" maxOccurs="1">
                                <annotation>
                                    <documentation>The value that describes the lithology as a controlled term (classification code or controlled name), rather than a simply descriptive one. Examples:

1) For soils described using the Unified Soil Classification, this value shall be the "group name", including any modifiers as defined in Figures 1,2 and 3 of ASTM D2487 or Figures 1 and 2 of ASTM D2488, eg "Silty sand" or "Gravelly silt with sand". Where only the group symbol is reported, the unmodifed group name for the symbol should be used, as shown in Table 1 of ASTM D2487.

2) For soils described using the AASHTO soil classification system, this value should be the group or subgroup classification (eg. "A-3", "A-2-6"). 

3) For soils classified using the USDA, Shepard (1954), or Folk classifications based on soil textures, this value would be the full-text textural classification, eg. "sandy loam" (USDA), "sand-silt-clay" (Shepard), or "muddy Sand" (Folk).

4) For soils classified using the British Soil Classification System, this value would be the recommended name (eg. "CLAY of very high plasticity"), or the group symbol if the standard name is not given (eg. "CV").

5) For rock, for example as defined by the American Geosciences Institute (AGI) glossary, this value would be the rock name (eg. "Dolostone", "Basalt", "Pebbly mudstone", etc.). 

Either a classificationCode value or lithDescription value must be present in the Lithology object. 

The codespace attribute should be a URL to an xml dictionary that conforms to the GML Dictionary.xsd and DIGGSDictionary_diggs.xsd schemas and that defines the terms used in the classification system within diggs:Definition elements. The value of classificationCode should be equivalent to a gml:name property of the associated diggs:Definition, for example: <![CDATA[
    <classificationCode codespace="https://diggsml.org/def/codes/DIGGS/0.1/astmD2488.xml#SWg">Well-graded sand with gravel</classificationCode>]]> An example diggs:Definition element within the dictionary would look as follows:<![CDATA[

        <diggs:Definition gml:id="SWg">
            <gml:description>SW with ≥ 15% gravel</gml:description>
            <gml:identifier codeSpace="https://diggsml.org/def/authorities.xml#DIGGS">https://diggsml.org/def/codes/DIGGS/0.1/astmD2487.xml#SWg</gml:identifier>
            <gml:name>Well-graded sand with gravel</gml:name>
            <diggs:dataType>string</diggs:dataType>
            <diggs:authority>ASTM D2487</diggs:authority>
            <diggs:reference>https://www.astm.org/d2487-17.html</diggs:reference>
            <diggs:occurrences>
                <diggs:Occurrence>
                    <diggs:sourceElementXpath>//diggs:Lithology/diggs:classificationCode</diggs:sourceElementXpath>
                </diggs:Occurrence>
            </diggs:occurrences>
        </diggs:Definition>]]>
        
The Geo-Institute has developed online dictionaries for ASTM D2487, ASTM D2488, AASHTO and USDA classification systems that should be referenced in instance documents that use those classifications.
 
Classification systems that do not have an online dictionary may be used, but the codeSpace attribute should be a URL to an online resource for the classification system rather than an uncontrolled string value. Such usage may limit interoperability and is not recommended - a dictionary should be developed for these cases.</documentation>
                                </annotation>
                            </element>
                            <element minOccurs="0" name="lithDescription"
                                type="diggs:DescriptorType">
                                <annotation>
                                    <documentation>This property provides descriptive information
                                        about the lithology and should be use in conjunction with
                                        classificationCode. If the information is recorded,
                                        lithDescription include a description of color,facies, grain
                                        size disctribution, constituents and field properties, even
                                        if those properties are not specifically encoded (eg.
                                        well-graded sand (SW), fine-grained, dark grey, massive,
                                        dry, hard). If the lithology description does not include
                                        any controlled term that serves to classify it, then
                                        lithDescription must be used instead of classificationCode,
                                        i.e., either classificationCode or lithDescription must
                                        contain a value (although both may contain values and is
                                        preferred). </documentation>
                                </annotation>
                            </element>
                        </sequence>
                        <sequence>
                            <element minOccurs="1" name="lithDescription"
                                type="diggs:DescriptorType">
                                <annotation>
                                    <documentation>This property provides descriptive information
                                        about the lithology and should be use in conjunction with
                                        classificationCode. If the information is recorded,
                                        lithDescription include a description of color,facies, grain
                                        size disctribution, constituents and field properties, even
                                        if those properties are not specifically encoded (eg.
                                        well-graded sand (SW), fine-grained, dark grey, massive,
                                        dry, hard). If the lithology description does not include
                                        any controlled term that serves to classify it, then
                                        lithDescription must be used instead of classificationCode,
                                        i.e., either classificationCode or lithDescription must
                                        contain a value (although both may contain values and is
                                        preferred). </documentation>
                                </annotation>
                            </element>
                        </sequence>
                    </choice>
                    <element minOccurs="0" name="classificationSymbol" maxOccurs="1"
                        type="gml:CodeType">
                        <annotation>
                            <documentation>For USCS, AASHTO or BSCS soil classification
                                        systems, this property holds the group symbol (for USCS) or
                                        the group or appropriate subgroup classification (for AASHTO
                                        and BSCS). Symbology for nan-standard or proprietary
                                        classifications may also be reported here. Codespace
                                        attribute is mandatory and should preferably a link to the
                                        associated DIGGS dictionary, or be either USCS, AASHTO, or
                                        BSCS for those systems, or an authority code for
                                        non-standard systems.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="groupIndexAASHTO" type="positiveInteger">
                        <annotation>
                            <documentation>For soils classified using the AASHTO system,
                                        this property holds the value of the group index (GI) as
                                        defined by: GI= (F–35)[0.2+0.005(LL– 40)}+(F–15)(PI–10)
                                        where F is the percentage passing the 75 μm (0.075 mm)
                                        sieve, expressed as a whole number, LL is the
                                        liquid limit and PI is the plasticity index.
                                    </documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" name="color" type="diggs:ColorPropertyType"
                        minOccurs="0">
                        <annotation>
                            <documentation>A color whose boundaries match those of the lithology
                                observation should be encoded in the enclosed Color object. If there
                                are depth-specific changes in color taht are significant and do not
                                match the boundaries of the lithologyObservation, then a ColorSystem
                                can be defined to represent those data instead of encoding separate
                                lithologyObservations to record only changes in color. Also,
                                ancillary color changes in color within a lithologyObservation can
                                be added as a description only within a
                                PlacedObservation.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="constituent" type="diggs:ConstituentPropertyType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Constituents are materials and structures associated with
                                this lithology, but not considered significant enough to record as
                                part of a ConstituentSystem, or where location within a lithology
                                observation is not important to preserve (except as a comment).
                                Constituents of a lithology are descriptions that generally fall
                                into one of the following classes: 1) types of sedimentary or
                                physical structures, 2) types of lithologic, mineralogic or organic
                                accessories (eg. presence of calcite, gas odor, etc.), 3) types and
                                degree of bioturbation features, 4) types of diagenetic structures,
                                5) types of physical structures produced by sampling, 6) types of
                                fossils, 7) types of trace fossils, 8) types of
                                fractures</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="componentProperties"
                        type="diggs:ComponentPropertiesPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="false" name="ComponentLith" type="diggs:ComponentLithType">
        <annotation>
            <documentation>A metadata object that holds the values of local coordinates for the
                reference point of the associated feature. This object is used to carry information
                about the location of a feature in its original local reference system if not
                originally recorded in a well-known geographic or projected CRS (with these new
                values entered into the feature's reference point property.</documentation>
        </annotation>
    </element>
    <element abstract="false" name="LocalCoordinate" type="diggs:LocalCoordinateType">
        <annotation>
            <documentation>A metadata object that holds the values of local coordinates for the
                reference point of the associated feature. This object is used to carry information
                about the location of a feature in its original local reference system if not
                originally recorded in a well-known geographic or projected CRS (with these new
                values entered into the feature's reference point property.</documentation>
        </annotation>
    </element>
    <complexType name="LocalCoordinatePropertyType">
        <sequence>
            <element ref="diggs:LocalCoordinate"/>
        </sequence>
    </complexType>
    <complexType name="LocalCoordinateType">
        <complexContent>
            <extension base="gml:AbstractMetadataPropertyType">
                <sequence>
                    <element minOccurs="0" name="easting" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The easting or x-coordinate value</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="northing" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The northing or y-coordinate value of the
                                feature</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="elevation" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Elevation value for the feature, positive
                                up</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="localCoodinateUncertainty"
                        type="diggs:LocationUncertaintyPropertyType">
                        <annotation>
                            <documentation>Elevation value for the feature, positive
                                up</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="originAxisAzimuth" type="diggs:BearingMeasureType">
                        <annotation>
                            <documentation>Origin axis azimuth for the northing and easting values,
                                reported as a bearing, positive clockwise from the reference
                                aziumuth reported in the refAzimuth attribute.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Locality" type="diggs:LocalityType" substitutionGroup="gml:AbstractGML"
        abstract="false">
        <annotation>
            <documentation>An object that describes non-coordinate location information for a
                feature.</documentation>
        </annotation>
    </element>
    <complexType name="LocalityPropertyType">
        <annotation>
            <documentation>PointLocation property choice is depreceated; use LocalCoordinate
                instead</documentation>
        </annotation>
        <choice>
            <element ref="diggs:Locality" minOccurs="1" maxOccurs="1"/>
            <element ref="diggs:PointLocation"/>
        </choice>
    </complexType>
    <complexType name="LocalityType">
        <complexContent>
            <extension base="diggs:AbstractObjectBaseType">
                <sequence>
                    <element name="address" type="diggs:AddressPropertyType" minOccurs="0"
                        maxOccurs="1"/>
                    <element name="district" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>Name or ID of a territory of land classified as a
                                District </documentation>
                        </annotation>
                    </element>
                    <element name="division" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>Name or ID of a territory of land classified as a
                                Division </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="lot" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>Name or ID of a territory of land classified as a Lot
                            </documentation>
                        </annotation>
                    </element>
                    <element name="parceI" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Name or ID of a territory of land classified as a Parcel
                            </documentation>
                        </annotation>
                    </element>
                    <element name="plss" type="diggs:PlssPropertyType" minOccurs="0" maxOccurs="1"/>
                    <element name="quadrangle" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>Name or ID of a territory of land classified as a map
                                quadrange </documentation>
                        </annotation>
                    </element>
                    <element name="route" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Name or ID of the route along which a centerline survey
                                is designated</documentation>
                        </annotation>
                    </element>
                    <element name="segment" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Name or ID for an interval or section of a route along
                                whick a centerline survey is designated.</documentation>
                        </annotation>
                    </element>
                    <element name="station" type="eml:LengthMeasureExt" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Name of the station along a centerline
                                survey. This must be a numeric value, with a unit of measure (eg. ft) specified in the uom attribute. Systems that store station values as a string that include a plus sign (+) need to strip out the + and specify the uom for encoding to DIGGS.
                                </documentation>
                        </annotation>
                    </element>
                    <element name="mileMarker" type="eml:LengthMeasure" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>A reference point along a route to indicate either
                                distance travelled or the remaining distance to a destination. Such
                                references are also used by maintenance engineers and emergency
                                services to direct them to specific points where their presence is
                                required. This term is sometimes used to denote a location on a road
                                even if no physical sign is present. This is a numerical value a may
                                differ from a station id used for specific route
                                surveys.</documentation>
                        </annotation>
                    </element>
                    <element name="offset" type="eml:LengthMeasureExt" minOccurs="0" maxOccurs="1"
                        form="qualified">
                        <annotation>
                            <documentation>Distance measured perpendicular from the station. Unless offsetDirection is specified, positive values imply an offset to the right when facing in the direction of increasing station value. Negative values imply an offset to the left.</documentation>
                        </annotation>
                    </element>
                    <element name="offsetDirection" type="diggs:offsetDirectionEnumExtType"
                        minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Direction of the offset measured along the centerline survey. Allowable values are left and right (when facing in the direction of increasing station value.</documentation>
                        </annotation>
                    </element>
                    <element name="tract" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Name or ID of a territory of land classified as a Tract
                            </documentation>
                        </annotation>
                    </element>
                    <element name="watershed" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>Name or ID of a territory of land classified as a
                                Watershed </documentation>
                        </annotation>
                    </element>
                    <element name="otherLocalityProperty" type="diggs:ParameterPropertyType"
                        minOccurs="0" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Other type of locality designation, given as a name-value
                                pair within a Parameter object.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="location" substitutionGroup="gml:domainSet" type="diggs:LocationPropertyType">
        <annotation>
            <documentation>A property that contains a geometry object defining a location for a
                feature or object. Typically the geometry of the SampleProduced is constrained by
                the geomtery of the SamplingFeature and typically the coordinates of the
                SampleProduced location are defined by the SamplingFeature's linear referencing
                property</documentation>
        </annotation>
    </element>
    <complexType name="LocationPropertyType">
        <complexContent>
            <restriction base="gml:DomainSetType">
                <sequence minOccurs="0">
                    <choice>
                        <element ref="diggs:AbstractGeometry"/>
                        <!--
DSB: REMOVED FROM PROFILE
        <element ref="gml:AbstractTimeObject"/>
        
-->
                    </choice>
                </sequence>
                <attributeGroup ref="gml:OwnershipAttributeGroup"/>
                <attributeGroup ref="gml:AssociationAttributeGroup"/>
            </restriction>
        </complexContent>
    </complexType>
    <element name="LocationUncertainty" type="diggs:LocationUncertaintyType"
        substitutionGroup="diggs:AbstractObject" abstract="false">
        <annotation>
            <documentation>An object that contains properties defining the uncertainty of a
                location.</documentation>
        </annotation>
    </element>
    <complexType name="LocationUncertaintyPropertyType">
        <sequence>
            <element ref="diggs:LocationUncertainty" minOccurs="1" maxOccurs="1">
                <annotation>
                    <documentation>Contains properties to define the uncertainty of a location
                        value.</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <complexType name="LocationUncertaintyType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="locationMethod" type="gml:CodeType">
                        <annotation>
                            <documentation>The method used to determine the coordinate information,
                                eg. GPS, Google Earth, surveyed, etc. Intended to come from a
                                controlled list of terms.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="xValueUncertainty"
                        type="diggs:UncertaintyPropertyType">
                        <annotation>
                            <documentation>Uncertainty for the x value of a location
                                coordinate.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="yValueUncertainty"
                        type="diggs:UncertaintyPropertyType">
                        <annotation>
                            <documentation>Uncertainty for the y value of a location coordinate,
                                applicable to 2D or 3D SRS'</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="zValueUncertainty"
                        type="diggs:UncertaintyPropertyType">
                        <annotation>
                            <documentation>Uncertainty for the z value of a location coordinate,
                                applicable to 3D SRS'</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <simpleType name="MatrixEnumType">
        <restriction base="string">
            <enumeration value="soil"/>
            <enumeration value="rock"/>
            <enumeration value="solid organic matter"/>
            <enumeration value="surficial"/>
        </restriction>
    </simpleType>
    <!-- Removed 2.5.b. Not used 
    <element name="MeasureOrString" type="diggs:MeasureOrStringType"
        substitutionGroup="gml:AbstractGML">
        <annotation>
            <documentation>An object that can contain a string or numeric property value. Deprecated.</documentation>
        </annotation>
    </element>
    <complexType name="MeasureOrStringType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <choice>
                    <element name="numeric" type="eml:generalMeasureType"/>
                    <element name="textual" type="diggs:DiggsStringType"/>
                </choice>
            </extension>
        </complexContent>
    </complexType>
  -->
    <simpleType name="MatrixEnumExtType">
        <union memberTypes="diggs:MatrixEnumType diggs:OtherNameType"> </union>
    </simpleType>
    <element name="measurementRef" type="diggs:FeatureReferenceType">
        <annotation>
            <appinfo source="urn:x-gml:targetElement">Diggs:Measurement</appinfo>
            <documentation>A reference to a Measurement feature that is associated with this
                feature. </documentation>
            <documentation>A property element that supports a value by reference only. The target
                value is indicated in the appinfo element.</documentation>
        </annotation>
    </element>
    <element name="Monitor" type="diggs:MonitorType" substitutionGroup="diggs:AbstractMeasurement">
        <annotation>
            <documentation>An act ("event"), whose results are estimates of the value of a property
                of the investigation target, measured at a time instant or within a time interval,
                and at a location or series of locations, derived from a test
                procedure.</documentation>
        </annotation>
    </element>
    <element name="MonitorResult" type="diggs:MonitorResultType"
        substitutionGroup="gml:AbstractCoverage">
        <annotation>
            <documentation>An object that contains properties of a monitoring activity
                result.</documentation>
        </annotation>
    </element>
    <complexType name="MonitorResultPropertyType">
        <sequence>
            <element ref="diggs:MonitorResult"/>
        </sequence>
    </complexType>
    <complexType name="MonitorResultType">
        <complexContent>
            <restriction base="gml:AbstractCoverageType">
                <sequence>
                    <element ref="diggs:timeDomain"/>
                    <element ref="diggs:results"/>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="MonitorType">
        <complexContent>
            <extension base="diggs:AbstractMeasurementType">
                <sequence>
                    <element name="reading" type="diggs:ReadingGroupPropertyType"
                        maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="MultiCurve" substitutionGroup="diggs:AbstractGeometry"
        type="diggs:MultiCurveType">
        <annotation>
            <documentation>A Diggs geometry object that holds a collection of curve
                geometries.</documentation>
        </annotation>
    </element>
    <complexType name="MultiCurvePropertyType">
        <sequence>
            <element ref="diggs:MultiCurve"/>
        </sequence>
    </complexType>
    <complexType name="MultiCurveType">
        <complexContent>
            <extension base="diggs:AbstractGeometricAggregateType">
                <sequence>
                    <element maxOccurs="unbounded" minOccurs="0" ref="gml:curveMember"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="MultiPointLocation" substitutionGroup="diggs:AbstractGeometry"
        type="diggs:SimpleMultiPointType">
        <annotation>
            <documentation>A Diggs geometry object that contains a collection of point
                locations.</documentation>
        </annotation>
    </element>
    <complexType name="NullDataType">
        <simpleContent>
            <extension base="string">
                <attribute name="reason" type="gml:NilReasonType" use="optional"/>
            </extension>
        </simpleContent>
    </complexType>
    <complexType name="ComponentObjectNoDescriptionType" mixed="false">
        <annotation>
            <documentation/>
        </annotation>
        <complexContent>
            <restriction base="diggs:AbstractComponentObjectType">
                <sequence>
                    <sequence>
                        <element minOccurs="0" ref="gml:identifier"/>
                    </sequence>
                    <sequence>
                        <element minOccurs="0" ref="diggs:status">
                            <annotation>
                                <documentation>A text string to provide information about the status
                                    of the object to be used to track QA/QC controls, review or
                                    release status, etc. The values used are intended to come from a
                                    controlled list of terms maintained by an
                                    organization.</documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="unbounded" minOccurs="0" name="remark"
                            type="diggs:RemarkPropertyType">
                            <annotation>
                                <documentation>Any comment or remark associated with this specific
                                    object.</documentation>
                            </annotation>
                        </element>
                    </sequence>
                </sequence>
                <attribute ref="gml:id" use="optional"/>
                <attribute ref="xml:lang"/>
            </restriction>
        </complexContent>
    </complexType>

    <complexType name="ObjectNoDescriptionType" mixed="false">
        <annotation>
            <documentation/>
        </annotation>
        <complexContent>
            <restriction base="diggs:AbstractObjectType">
                <sequence>
                    <sequence>
                        <element minOccurs="0" ref="gml:identifier"/>
                    </sequence>
                    <sequence>
                        <element minOccurs="0" ref="diggs:status">
                            <annotation>
                                <documentation>A text string to provide information about the status
                                    of the object to be used to track QA/QC controls, review or
                                    release status, etc. The values used are intended to come from a
                                    controlled list of terms maintained by an
                                    organization.</documentation>
                            </annotation>
                        </element>
                        <element maxOccurs="unbounded" minOccurs="0" name="remark"
                            type="diggs:RemarkPropertyType">
                            <annotation>
                                <documentation>Any comment or remark associated with this specific
                                    object.</documentation>
                            </annotation>
                        </element>
                    </sequence>
                </sequence>
                <attribute ref="gml:id" use="required"/>
                <attribute ref="xml:lang"/>
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="ObservationSystemPropertyType">
        <sequence>
            <element ref="diggs:AbstractObservationSystem"/>
        </sequence>
    </complexType>
    <element name="Orientation" substitutionGroup="diggs:AbstractObject"
        type="diggs:OrientationType">
        <annotation>
            <documentation>An object containing properties of of bedding, fracture, or zone orientation.</documentation>
        </annotation>
    </element>
    <element name="OrientationObservation" substitutionGroup="diggs:AbstractObservation"
        type="diggs:OrientationObservationType">
        <annotation>
            <documentation>Orientation observations describe the geometry of vectors or planar
                surfaces encountered at a sampling feature, such as bedding, joints, cross-beds,
                etc. These observations are designed to characterize regions with generalized
                geometries. Individual measurements of planar geometries of boundaries or faults are
                recorded in Discontinuity or Lithology observations. </documentation>
        </annotation>
    </element>
    <simpleType name="OrientationObsPropertyEnumType">
        <union>
            <simpleType>
                <restriction base="string">
                    <enumeration value="bedding"/>
                    <enumeration value="cross-bedding"/>
                    <enumeration value="faults"/>
                    <enumeration value="joints"/>
                    <enumeration value="fractures"/>
                </restriction>
            </simpleType>
            <simpleType>
                <restriction base="string">
                    <pattern value="Other: .{2,}"/>
                </restriction>
            </simpleType>
        </union>
    </simpleType>
    <complexType name="OrientationObservationType">
        <complexContent>
            <extension base="diggs:AbstractObservationType">
                <sequence>
                    <element name="orientation" type="diggs:OrientationPropertyType"/>
                    <element maxOccurs="unbounded" minOccurs="0" ref="diggs:placedObservation"/>
                    <element minOccurs="0" ref="diggs:baseBoundary">
                        <annotation>
                            <documentation>Description of the boundary at the base of the observed
                                zone or interval as defined in the observation's location
                                property</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="OrientationPropertyType">
        <sequence>
            <element ref="diggs:Orientation"/>
        </sequence>
    </complexType>
    <element name="OrientationSystem" substitutionGroup="diggs:AbstractObservationSystem"
        type="diggs:OrientationSystemType">
        <annotation>
            <documentation>An object that contains a system of Orientation observations.
                Observations within an orientation zone system must not overlap.</documentation>
        </annotation>
    </element>
    <complexType name="OrientationSystemType">
        <complexContent>
            <extension base="diggs:AbstractObservationSystemType">
                <sequence>
                    <element name="orientationFeatureType"
                        type="diggs:OrientationObsPropertyEnumType">
                        <annotation>
                            <documentation>Selection from an enumerated list defining the type of
                                planar feature whose orientations are being described in this system
                                (eg. faults, bedding)</documentation>
                        </annotation>
                    </element>
                    <element name="orientationFeatureObservation"
                        type="diggs:OrientationObservationPropertyType" maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="OrientationObservationPropertyType">
        <sequence maxOccurs="1">
            <element maxOccurs="1" ref="diggs:OrientationObservation"/>
        </sequence>
    </complexType>
    <complexType name="OrientationType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element name="strikeOrBearing" type="eml:PlaneAngleMeasure">
                        <annotation>
                            <documentation>The true bearing of the feature (if linear) or strike of
                                the plane, from north (range 0-360), where 0 is north and 90 east,
                                etc.</documentation>
                        </annotation>
                    </element>
                    <element name="dipOrPlunge" type="diggs:DipMeasureType">
                        <annotation>
                            <documentation>The inclination of the feature from horizontal (eg. 0 is
                                vertical, 90 degrees is vertical DOWN)</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="originalProjectRef" type="diggs:FeatureReferenceType">
        <annotation>
            <appinfo source="urn:x-gml:targetElement">Diggs:Project</appinfo>
            <documentation>A property element that supports a value by reference only. The target
                value is indicated in the appinfo element.</documentation>
            <documentation>A reference to the project that first established this
                feature</documentation>
        </annotation>
    </element>
    <element name="originalSamplingFeatureRef" type="diggs:FeatureReferenceType">
        <annotation>
            <appinfo source="urn:x-gml:targetElement">Diggs:AbstractSamplingFeature</appinfo>
            <documentation>A reference to a sampling feature that was created by this feature. </documentation>
            <documentation>A property element that supports a value by reference only. The target
                value is indicated in the appinfo element.</documentation>
        </annotation>
    </element>
    <element name="OtherObservation" substitutionGroup="diggs:AbstractObservation"
        type="diggs:OtherObservationType">
        <annotation>
            <documentation>A structure for defining a zone system of unknown type. Observations
                consist of name-value pairs, where these names should reference code lists. As this
                is an "open" description, no Schematron controls are appropriate here unless defined
                for a specific use case.</documentation>
        </annotation>
    </element>
    <complexType name="OtherObservationPropertyType">
        <sequence maxOccurs="1">
            <element maxOccurs="1" ref="diggs:OtherObservation"/>
        </sequence>
    </complexType>
    <element name="OtherObservationSystem" substitutionGroup="diggs:AbstractObservationSystem"
        type="diggs:OtherObservationSystemType">
        <annotation>
            <documentation>An object containing a system of OtherObservation
                objects.</documentation>
        </annotation>
    </element>
    <complexType name="OtherObservationType">
        <complexContent>
            <extension base="diggs:AbstractObservationType">
                <sequence>
                    <element name="property" type="diggs:ParameterPropertyType"
                        maxOccurs="unbounded"/>
                    <element maxOccurs="unbounded" minOccurs="0" ref="diggs:placedObservation"/>
                    <element minOccurs="0" ref="diggs:baseBoundary">
                        <annotation>
                            <documentation>Description of the boundary at the base of the observed
                                zone or interval as defined in the observation's location
                                property</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="OtherObservationSystemType">
        <complexContent>
            <extension base="diggs:AbstractObservationSystemType">
                <sequence>
                    <element name="otherSystemType" type="gml:CodeType">
                        <annotation>
                            <documentation>The kind of "Other Observation" system described.
                            </documentation>
                        </annotation>
                    </element>
                    <element name="otherObservation" type="diggs:OtherObservationPropertyType"
                        maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <simpleType name="OtherNameType">
        <annotation>
            <documentation>A type used to extend a controlled list, used where none of the
                enumerations are suitable for transfer. An enumeration of the form Other:xx (where
                xx are two or more characters) will be schmema valid but use of the Other" prefix
                can result in interoperability issues. </documentation>
        </annotation>
        <restriction base="string">
            <pattern value="Other: .{2,}"/>
        </restriction>
    </simpleType>
    <element name="Parameter" substitutionGroup="diggs:AbstractComponentObjectBase"
        type="diggs:ParameterType">
        <annotation>
            <documentation>An object containing the name, value or range of values and unit of
                measure of a property or a measurement parameter (result).</documentation>
        </annotation>
    </element>
    <element name="parameters" substitutionGroup="gml:rangeParameters"
        type="diggs:PropertyInfoPropertyType">
        <annotation>
            <documentation>An object that contains Diggs property parameters.</documentation>
        </annotation>
    </element>
    <complexType name="ParameterType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element minOccurs="0" ref="diggs:index">
                        <annotation>
                            <documentation>Deprecated - use index attribute instead</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="1" name="parameterName" type="gml:CodeType">
                        <annotation>
                            <documentation>A description or code to what the value property
                                represents. This is intended to be a controlled value from an
                                authority. If gml:name is also used for this parameter, the value of
                                parameterName must be the primary name defined for the parameter,
                                whereas gml:name provides additional paramter names defined by
                                ancillary authorities. </documentation>
                        </annotation>
                    </element>
                    <choice>
                        <element minOccurs="1" name="parameterValue" type="diggs:DiggsStringType">
                            <annotation>
                                <documentation>A value associated with the name.</documentation>
                            </annotation>
                        </element>
                        <sequence>
                            <element name="parameterMinValue" type="double">
                                <annotation>
                                    <documentation>For numeric parameter values where a value range
                                        is expressed instead of a fixed value, this property
                                        contains the minimum value of the range. </documentation>
                                </annotation>
                            </element>
                            <element minOccurs="0" name="parameterValue"
                                type="diggs:DiggsStringType">
                                <annotation>
                                    <documentation>A value associated with the name.</documentation>
                                </annotation>
                            </element>
                            <element name="parameterMaxValue" type="double">
                                <annotation>
                                    <documentation>For numeric parameter values where a value range
                                        is expressed instead of a fixed value, this property
                                        contains the maximum value of the range. </documentation>
                                </annotation>
                            </element>
                        </sequence>
                    </choice>
                    <element name="parameterUnits" type="diggs:AllUnits" minOccurs="0">
                        <annotation>
                            <documentation>Unit of measure of the parameter.</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute name="index" type="positiveInteger" use="optional">
                    <annotation>
                        <documentation>An integer that indicates the order of the parameter
                            results.Optional in this context</documentation>
                    </annotation>
                </attribute>

            </extension>
        </complexContent>
    </complexType>
    <complexType name="ParameterPropertyType">
        <sequence maxOccurs="1">
            <element ref="diggs:Parameter" maxOccurs="1" minOccurs="1"/>
        </sequence>
    </complexType>
    <complexType name="ParameterArrayPropertyType">
        <sequence maxOccurs="unbounded" minOccurs="1">
            <element ref="diggs:Parameter" maxOccurs="1" minOccurs="1"/>
        </sequence>
    </complexType>
    <element name="ParticleSize" type="diggs:ParticleSizeType">
        <annotation>
            <documentation>An object that contains properties of a particle size
                measurement.</documentation>
        </annotation>
    </element>
    <element name="ParticleSizeDistribution" type="diggs:ParticleSizeDistributionType"/>
    <complexType name="ParticleSizeDistributionPropertyType">
        <sequence>
            <element ref="diggs:ParticleSizeDistribution">
                <annotation>
                    <documentation>A object that provides summary particle size distribution
                        information (eg. modal grain size, median grain size, d10, d60) etc) for a
                        lithology.</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <complexType name="ParticleSizeDistributionType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element minOccurs="0" name="meanGrainsize"
                        type="diggs:ParticleSizePropertyType">
                        <annotation>
                            <documentation>A text descriptor (eg. fine sand) or numeric value
                                representing the mean grain size.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="modalGrainsize"
                        type="diggs:ParticleSizePropertyType">
                        <annotation>
                            <documentation>A text descriptor (eg. fine sand) or numeric value
                                representing the modal grain size.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="equivalentDiameter"
                        type="diggs:ParticleSizePropertyType">
                        <annotation>
                            <documentation>A text descriptor (eg. fine sand) or numeric value
                                representing the equivalent diameter for the soil.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="minimumDiameter"
                        type="diggs:ParticleSizePropertyType">
                        <annotation>
                            <documentation>A text descriptor (eg. fine sand) or numeric value
                                representing the minimum diameter of particles in the
                                soil.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="maximumDiameter"
                        type="diggs:ParticleSizePropertyType">
                        <annotation>
                            <documentation>A text descriptor (eg. fine sand) or numeric value
                                representing the maximum diameter of particles in the
                                soil.</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute name="howDetermined" type="diggs:DescriptorMethodEnumType">
                    <annotation>
                        <documentation>A value that describes the method by which the observation or measurement
                            was determined. </documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="ParticleSizePropertyType">
        <sequence>
            <element ref="diggs:ParticleSize"/>
        </sequence>
    </complexType>
    <complexType name="ParticleSizeType">
        <complexContent>
            <extension base="diggs:ObjectNoDescriptionType">
                <choice>
                    <annotation>
                        <documentation>Either particleSizeValue or particalSizeDescription should be
                            present. Both are allowed.</documentation>
                    </annotation>
                    <sequence>
                        <element name="particleSizeValue" type="diggs:ParticleSizeValueType"
                            minOccurs="1">
                            <annotation>
                                <documentation>A numeric value for the particle size, in length
                                    units such as mm diameter, or phi.</documentation>
                            </annotation>
                        </element>
                        <element name="particleSizeDescription" type="gml:CodeType" minOccurs="0">
                            <annotation>
                                <documentation>A text description for the particle size, such as
                                    "very fine sand", etc.</documentation>
                            </annotation>
                        </element>
                    </sequence>
                    <sequence>
                        <element name="particleSizeDescription" type="gml:CodeType" minOccurs="1">
                            <annotation>
                                <documentation>A text description for the particle size, such as
                                    "very fine sand", etc.</documentation>
                            </annotation>
                        </element>
                    </sequence>
                </choice>
            </extension>
        </complexContent>
    </complexType>
    <simpleType name="particleSizeUom">
        <restriction base="eml:UomEnum">
            <enumeration value="in"/>
            <enumeration value="mm"/>
            <enumeration value="micron"/>
            <enumeration value="phi"/>
        </restriction>
    </simpleType>
    <complexType name="ParticleSizeValueType">
        <simpleContent>
            <extension base="double">
                <attribute name="uom" type="diggs:particleSizeUom" use="required"/>
            </extension>
        </simpleContent>
    </complexType>
    <simpleType name="PercentEnumType">
        <union memberTypes="eml:DimensionlessUom diggs:PermilEnumType"/>
    </simpleType>
    <simpleType name="PermilEnumType">
        <restriction base="string">
            <enumeration value="per mil"/>
        </restriction>
    </simpleType>
    <simpleType name="PhoneEnumType">
        <restriction base="string">
            <enumeration value="voice"/>
            <enumeration value="fax"/>
            <enumeration value="mobile"/>
            <enumeration value="voice/fax"/>
            <enumeration value="voicemail"/>
        </restriction>
    </simpleType>
    <simpleType name="PhoneNumberStringType">
        <annotation>
            <documentation>A string value pattern restricted to accept US or International phone
                numbers with some flexibility in formatting, such as: +1 555 123 4567 +442071234567
                (555) 123-4567 555.123.4567 5551234567 +33 1 23 45 67 89</documentation>
        </annotation>
        <restriction base="string">
            <pattern
                value="(\+[0-9]( )?)?([0-9]( |-|\.|)){6,14}[0-9]|(\([0-9]{3}\)[-. ]?|[0-9]{3}[-. ])[0-9]{3}[-. ]?[0-9]{4} "
            />
        </restriction>
    </simpleType>
    <complexType name="PhoneType">
        <simpleContent>
            <extension base="diggs:PhoneNumberStringType">
                <attribute name="type" type="diggs:ExtPhoneEnumType"/>
            </extension>
        </simpleContent>
    </complexType>
    <element name="PlanarObservationRepresentation" type="diggs:PlanarObservationRepresentationType"
        substitutionGroup="diggs:AbstractGeometry">
        <annotation>
            <documentation>An object that defines the geometry of a planar surface
                observation.</documentation>
        </annotation>
    </element>
    <complexType name="PlanarObservationRepresentationType">
        <complexContent>
            <extension base="diggs:AbstractGeometryType">
                <sequence>
                    <element name="layerTopIntersection" type="diggs:MultiCurvePropertyType">
                        <annotation>
                            <documentation>The location of the top surface of a layer (a volume of
                                earth material) that intersects a planar sampling feature. Depending
                                on how a planar sampling feature is encoded, there could be multiple
                                line strings that define this top surface.</documentation>
                        </annotation>
                    </element>
                    <element name="layerBaseIntersection" type="diggs:MultiCurvePropertyType">
                        <annotation>
                            <documentation>The location of the basal surface of a layer (a volume of
                                earth material) that intersects a planar sampling feature. Depending
                                on how a planar sampling feature is encoded, there could be multiple
                                line strings that define this basal surface.</documentation>
                        </annotation>
                    </element>
                    <element name="representativeSurface" type="diggs:AbstractSurfacePropertyType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>One or more polygons that represent the layer volume in
                                the plane of the planar sampling feature. This would typically be a
                                ring polygon with curve members that consist of the layer top
                                intersection, layer bottom intersection, and two edges that would
                                normally be at the lateral extent of the planar
                                feature.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="PLSS" type="diggs:PlssType" substitutionGroup="diggs:AbstractObject"
        abstract="false">
        <annotation>
            <documentation>Land subdivisions of the US Public Land Survey System</documentation>
        </annotation>
    </element>
    <complexType name="PlssPropertyType">
        <sequence>
            <element ref="diggs:PLSS" minOccurs="1" maxOccurs="1"/>
        </sequence>
    </complexType>
    <complexType name="PlssType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element name="township" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>An approximately 6-mile square area of land, containing
                                36 sections. Also, a horizontal row of townships in the
                                PLSS.</documentation>
                        </annotation>
                    </element>
                    <element name="range" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>A vertical column of townships in the
                                PLSS.</documentation>
                        </annotation>
                    </element>
                    <element name="section" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>The name of the section; a one-square-mile block of land,
                                containing 640 acres, or approximately one thirty-sixth of a
                                township. Due to the curvature of the Earth, sections may
                                occasionally be slightly smaller than one square
                                mile.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="aliquotPart" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>The name of the standard subdivisions of a section, such
                                as a half section, quarter section, or quarter-quarter
                                section.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="governmentLot" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>The name of a subpart of a section which is not described
                                as an aliquot part of the section, but which is designated by
                                number, for example, Lot 3. A lot may be regular or irregular in
                                shape, and its acreage may vary from that of regular aliquot parts.
                                These lots frequently border water areas excluded from the
                                PLSS.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="baseAndMeridian" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>The name of the point chosen as the starting point for
                                all sectionalized land within a given area. Ths point is located at
                                the intersection of a base line (parallel of latitude, or
                                approximately a parallel of latitude), and a principal
                                meridian.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="landGrant" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>The name of an area of land to which title was conferred
                                by a predecessor government and confirmed by the U.S Government
                                after the territory in which it is situated was acquired by the
                                United States. These lands were never part of the original public
                                domain and were not subject to subdivision by the
                                PLSS.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="PointLocation" substitutionGroup="diggs:AbstractGeometry" type="diggs:PointType">
        <annotation>
            <documentation>A Diggs geometry object defining a point location.</documentation>
        </annotation>
    </element>
    <complexType name="PointLocationPropertyType">
        <complexContent>
            <restriction base="gml:DomainSetType">
                <sequence minOccurs="0">
                    <choice>
                        <element ref="diggs:PointLocation"/>
                        <!--
DSB: REMOVED FROM PROFILE
        <element ref="gml:AbstractTimeObject"/>
        
-->
                    </choice>
                </sequence>
                <attributeGroup ref="gml:OwnershipAttributeGroup"/>
                <attributeGroup ref="gml:AssociationAttributeGroup"/>
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="PointType">
        <complexContent>
            <extension base="diggs:AbstractGeometricPrimitiveType">
                <sequence>
                    <choice>
                        <element ref="gml:pos"/>
                    </choice>
                    <element minOccurs="0" name="uncertainty"
                        type="diggs:LocationUncertaintyPropertyType">
                        <annotation>
                            <documentation>Provides accuracy information for the
                                referencePoint.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="PolygonPatchType">
        <complexContent>
            <extension base="gml:AbstractSurfacePatchType">
                <sequence>
                    <element minOccurs="0" ref="gml:exterior"/>
                    <element maxOccurs="unbounded" minOccurs="0" ref="gml:interior"/>
                    <element minOccurs="0" name="uncertainty" type="diggs:UncertaintyPropertyType"/>
                </sequence>
                <attribute fixed="planar" name="interpolation" type="gml:SurfaceInterpolationType"/>
            </extension>
        </complexContent>
    </complexType>
    <element name="PolygonPatch" substitutionGroup="gml:AbstractSurfacePatch"
        type="diggs:PolygonPatchType">
        <annotation>
            <documentation>A Diggs geometry object defining a polygon that serves as the definition
                of a patch comprising a MultiPlanarSurface</documentation>
        </annotation>
    </element>
    <complexType name="PolygonType">
        <complexContent>
            <extension base="diggs:AbstractSurfaceType">
                <sequence>
                    <element minOccurs="0" ref="gml:exterior"/>
                    <element maxOccurs="unbounded" minOccurs="0" ref="gml:interior"/>
                    <element minOccurs="0" name="uncertainty"
                        type="diggs:LocationUncertaintyPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="pressureMeasureType">
        <simpleContent>
            <extension base="eml:AbstractMeasure">
                <attribute name="uom" type="diggs:diggsPressureUom" use="required"/>
            </extension>
        </simpleContent>
    </complexType>
    <complexType name="TestProcedurePropertyType">
        <sequence>
            <element minOccurs="1" ref="diggs:AbstractProcedure" maxOccurs="1"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <complexType name="ProcedurePropertyType">
        <sequence>
            <element minOccurs="0" ref="diggs:AbstractProcedure" maxOccurs="1"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <element name="Project" type="diggs:ProjectType" substitutionGroup="diggs:AbstractProject"
        abstract="false">
        <annotation>
            <documentation>A Project is a business activity that encompasses a collection of
                sampling features, activities, samples, observations and measurements. A project may
                occur at a physical location, in which case it can optionally contain geometries. A
                project is typically associated with an investigation or construction activity for
                which there a specific outcome anticipated - eg. a research publication, design, or
                an actual geotechnical construction (eg. deep foundation, earthwork,
                etc.)</documentation>
        </annotation>
    </element>
    <element name="ProjectEvent" type="diggs:ProjectEventType">
        <annotation>
            <documentation>An object that contains properties of time or location related events
                associated with a project.</documentation>
        </annotation>
    </element>
    <complexType name="ProjectEventPropertyType">
        <sequence>
            <element ref="diggs:ProjectEvent"/>
        </sequence>
    </complexType>
    <complexType name="ProjectEventType">
        <complexContent>
            <extension base="diggs:AbstractEventType">
                <sequence/>
            </extension>
        </complexContent>
    </complexType>
    <element name="ProjectGroup" substitutionGroup="diggs:AbstractGroup"
        type="diggs:ProjectGroupType">
        <annotation>
            <documentation>A top level Diggs feature defining a related group of
                projects.</documentation>
        </annotation>
    </element>
    <complexType name="ProjectGroupType">
        <complexContent>
            <extension base="diggs:AbstractGroupType">
                <choice>
                    <element maxOccurs="unbounded" ref="diggs:projectRef" minOccurs="1"/>
                </choice>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="ProjectPropertyType">
        <sequence>
            <element ref="diggs:AbstractProject" minOccurs="1" maxOccurs="1"> </element>
        </sequence>
    </complexType>
    <element name="projectRef" type="diggs:FeatureReferenceType">
        <annotation>
            <appinfo source="urn:x-gml:targetElement">Diggs:Project</appinfo>
            <documentation>A reference to a project that uses the feature within its business
                activity. The project referenced here is the associated project for this
                instance.</documentation>
            <documentation>A property element that supports a value by reference only. The target
                value is indicated in the appinfo element.</documentation>
        </annotation>
    </element>
    <element abstract="true" name="AbstractProject" substitutionGroup="diggs:AbstractFeature"
        type="diggs:AbstractProjectType"/>
    <complexType name="AbstractProjectType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractNamedFeatureType">
                <sequence>

                    <element name="referencePoint" type="diggs:PointLocationPropertyType"
                        minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Defines the location of the project (usually a location
                                at the ground surface) within a well-known 3D CRS or combined CRS
                                (geographic or projected, and elevation), as an extension of
                                gml:Point object with an additional uncertainty property
                            </documentation>
                        </annotation>
                    </element>
                    <element name="linearExtent" type="diggs:LinearExtentPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Defines a project geometry that may be defined as a line
                                in geographic or projected space and contains a LinearExtent
                                geometry object. </documentation>
                        </annotation>
                    </element>
                    <element name="arealExtent" type="diggs:AbstractSurfacePropertyType"
                        minOccurs="0" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Defines a project geometry that represents the areal
                                extent of a project in geographic or projected space and contains a
                                surface geometry object.</documentation>
                        </annotation>
                    </element>
                    <element name="projectDateTimeSpan" type="diggs:TimeIntervalPropertyType"
                        minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>The interval of time during which the project was
                                active.</documentation>
                        </annotation>
                    </element>
                    <element name="locality" type="diggs:LocalityPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Contains either a Locality object or a PointLocation
                                object that describes, repectively, the non-coordinate or coordinate
                                location of the project. If only one locality property exists for
                                the project, referencePoint should be used to desccribe the
                                coordinate location for the project instead of the PointLocation
                                object.</documentation>
                        </annotation>
                    </element>
                    <element name="purpose" type="gml:CodeType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>A string descxribing the purpose for the project. This is
                                intended to come from a controlled list of terms.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="projectEvent"
                        type="diggs:ProjectEventPropertyType">
                        <annotation>
                            <documentation>Contains a ProjectEvent property describing the
                                occurrence of a time or location related event associated with a
                                project.</documentation>
                        </annotation>
                    </element>
                    <element name="contract" type="diggs:ContractPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Contains a Contract object that describes the properties
                                of a business contract associated with the project. </documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="otherProjectProperty"
                        type="diggs:ParameterPropertyType">
                        <annotation>
                            <documentation>Contains a Parameter object used to describe the name and
                                value of a project property not otherwise explicitly defined in the
                                schema.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="ProjectType">
        <complexContent>
            <extension base="diggs:AbstractProjectType">
                <sequence/>
            </extension>
        </complexContent>
    </complexType>
    <element name="properties" substitutionGroup="gml:valueComponents"
        type="diggs:PropertiesPropertyYype">
        <annotation>
            <documentation>A property that contains a sequence of Property objects that
                hold the measured properties of a test or monitoring activity.</documentation>
        </annotation>
    </element>
    <complexType name="PropertiesPropertyYype">
        <complexContent>
            <restriction base="gml:ValueArrayPropertyType">
                <sequence maxOccurs="unbounded">
                    <!--DSB: Restricted in this profile
        <group ref="gml:Value"/>-->
                    <element ref="diggs:Property"/>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <element name="Property" type="diggs:PropType" substitutionGroup="gml:AbstractValue"
        abstract="false">
        <annotation>
            <documentation>An object that contains properties of a measurement
                result.</documentation>
        </annotation>
    </element>
    <simpleType name="PropertyDataTypeEnumType">
        <union memberTypes="diggs:dataTypeEnumType">
            <simpleType>
                <restriction base="string">
                    <enumeration value=""/>
                </restriction>
            </simpleType>
        </union>
    </simpleType>
    <simpleType name="UomTypeEnumType">
        <restriction base="string">
            <enumeration value="density or unit weight"/>
            <enumeration value="reciprocal time squared"/>
            <enumeration value="force time per volume"/>
        </restriction>
    </simpleType>
    <simpleType name="PropertyUomTypeEnumType">
        <union memberTypes="eml:QuantityClassKind diggs:UomTypeEnumType">
            <simpleType>
                <restriction base="string">
                    <pattern value="Other: .{2,}"/>
                </restriction>
            </simpleType>
        </union>
    </simpleType>
    <complexType name="PropertyInfoPropertyType">
        <complexContent>
            <restriction base="gml:AssociationRoleType">
                <sequence minOccurs="1">
                    <element ref="diggs:PropertyParameters"/>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <element name="PropertyParameters" type="diggs:PropertyParametersType"
        substitutionGroup="gml:CompositeValue">
        <annotation>
            <documentation>An object that contains the properties of a measurement
                result.</documentation>
        </annotation>
    </element>
    <complexType name="PropertyParametersType">
        <complexContent>
            <restriction base="gml:CompositeValueType">
                <sequence>
                    <element ref="diggs:properties" minOccurs="1"/>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="PropType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element maxOccurs="1" minOccurs="0" name="propertyName" type="gml:CodeType">
                        <annotation>
                            <documentation>A code or name for the property as used by the data
                                provider. This value can come from a controlled list of terms or be
                                an uncontrolled text string. The value would be commonly used to
                                label a column of a log sheet or provide other local meaning to the
                                property. The value of mnemonic should be unique for all of the
                                properties included in the dataValue block transmitted as part of
                                this measurement.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="1" name="typeData"
                        type="diggs:PropertyDataTypeEnumType">
                        <annotation>
                            <documentation>The data type for this property (eg. double, long,
                                string, etc.)</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="1" name="propertyClass"
                        type="gml:CodeWithAuthorityType">
                        <annotation>
                            <documentation>The official name of this property as derived from a
                                dictionary of defined terms. The codespace value must be populated
                                and should contain the URN to allow applications to validate this
                                value as a known property.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="uom" type="diggs:AllUnits">
                        <annotation>
                            <documentation>Unit of measurement for the property.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="atTemperature"
                        type="eml:ThermodynamicTemperatureMeasure">
                        <annotation>
                            <documentation>Temperature at which property value is valid, eg. for
                                specific gravity of solids at 20 deg C, this parameter would hold
                                the temperature value</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="measurementAxisBearing"
                        type="eml:PlaneAngleMeasure">
                        <annotation>
                            <documentation>Compass bearing direction (relative to true north)
                                defining the measurement axis direction (for directional
                                measurements, eg. component of an extensometer, accelerometer,
                                etc.)</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="measurementAxisInclination"
                        type="eml:PlaneAngleMeasure">
                        <annotation>
                            <documentation>Inclination of measurement axis (measured positively down
                                from horizontal); used for directional measurements, eg.
                                extensometer, accelerometer, etc. </documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="nullValue" type="diggs:NullDataType">
                        <annotation>
                            <documentation>An empty string is the default representation of a null
                                value for a property (i.e. when the null value representation is not
                                explicitly defined). This value defines a value to be interpreted as
                                null for this property in the dataValues block. The reason attribute
                                can be used to define the reason for the null value, (eg. witheld).
                                This can be customized with an other: qualifier (eg. other:below
                                detection limit) or reference a URI for a more complete
                                definition.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="context" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>If the property should be interpreted in a particular
                                context (eg. value is only valid for range of overburden pressures,
                                etc.), then the context of the property is described
                                here.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="sampleFraction" type="diggs:SampleFractionEnumType">
                        <annotation>
                            <documentation>Fraction of total sample analyzed (from enumerated list).
                                Applies primarily to non-soil type samples </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="grainsizeFraction"
                        type="diggs:SizeFractionPropertyType">
                        <annotation>
                            <documentation>For properties of soils, the size fraction that this
                                property pertains to </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" maxOccurs="unbounded" name="correctionUsed"
                        type="gml:CodeType">
                        <annotation>
                            <documentation>A description of corrections used to obtain the reported
                                result. Commonly used to report N-values from SPT tests, or to
                                describe any other adjustments made to the reported data. Can come
                                from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="measurementTechnique"
                        type="diggs:MeasurementTechniqueEnumType">
                        <annotation>
                            <documentation>The method by which the property value is obtained. From
                                an enumerated list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="procedureRef" type="diggs:FeatureReferenceType"/>
                    <element name="detectorRef" type="gml:ReferenceType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <appinfo>diggs:Detector</appinfo>
                            <documentation>A property element that supports a value by reference
                                only. The target value is indicated in the appinfo
                                element.</documentation>
                            <documentation>A reference to the source detector within a sensor used
                                to measure this property, if applicable. Generally used for well
                                log,downhole logging procedures, monitorin equipment, or MWD
                                readings.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="detectionLimits"
                        type="diggs:LimitPropertyType">
                        <annotation>
                            <documentation>Identifies the detection limits for this property in the
                                UOM for this property</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="reportable" type="boolean"
                        default="true">
                        <annotation>
                            <documentation>True or false, indicates whether the value of this
                                property can be reported outside of the context of transmission via
                                an xml instance.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="qualifier"
                        type="diggs:QualifierPropertyType">
                        <annotation>
                            <documentation>One or more parameter objects (listing name, value or
                                min/max value of parameters that may be used to qualify the result
                                of this property</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="curveState"
                        type="witsml:ChannelState">
                        <annotation>
                            <documentation>Used for well logging procedures, to define the state or
                                status of the data described by the well log curve. From an
                                enumerated list.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="curveDerivation"
                        type="witsml:ChannelDerivation">
                        <annotation>
                            <documentation>For well logging procedures, defines the source of the
                                data.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="samplingRate"
                        type="eml:ReciprocalTimeMeasure">
                        <annotation>
                            <documentation>The raw rate of measurement collection from which any
                                moving averages may be derived. This property should be reported if
                                the value of the measurementTechnique property is moving
                                average.</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute name="index" type="positiveInteger" use="required">
                    <annotation>
                        <documentation>An integer that indicates the position of the property result
                            in the dataValues property.</documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="false" name="Qualifier" substitutionGroup="diggs:AbstractComponentObjectBase"
        type="diggs:ParameterType">
        <annotation>
            <documentation>An enumeration of various parameters upon which the property result may
                be qualified</documentation>
        </annotation>
    </element>
    <simpleType name="QualifierEnumType">
        <restriction base="string">
            <enumeration value="upper"/>
            <enumeration value="lower"/>
            <enumeration value="method"/>
            <enumeration value="quantification"/>
            <enumeration value="reporting"/>
            <enumeration value="minimum allowable value"/>
            <enumeration value="maximum allowable value"/>
        </restriction>
    </simpleType>
    <complexType name="QualifierPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:Qualifier"/>
        </sequence>
    </complexType>
    <element name="Reading" type="diggs:ReadingType">
        <annotation>
            <documentation>An object that contains properties describing the results of a monitoring
                activity. </documentation>
        </annotation>
    </element>
    <complexType name="ReadingGroupPropertyType">
        <sequence maxOccurs="1" minOccurs="1">
            <element maxOccurs="1" minOccurs="1" ref="diggs:Reading"/>
        </sequence>
    </complexType>
    <complexType name="ReadingType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <choice>
                        <element name="responseZoneLocation" type="diggs:LocationPropertyType">
                            <annotation>
                                <documentation>Identifies the location of the response zone within
                                    the sampling feature that is being monitored. For example, for a
                                    water level measurement, the location would be the depth
                                    interval in the well where perforations are located (or where
                                    water enters the well)</documentation>
                            </annotation>
                        </element>
                        <element minOccurs="1" ref="diggs:responseZoneLocationRef">
                            <annotation>
                                <documentation>The location of the description referenced to the
                                    sampling feature's or sample's linear spatial reference system.
                                    This is deprecated in favor of using an xlink:href attribute in
                                    the resposeZoneLocation property.</documentation>
                            </annotation>
                        </element>
                    </choice>
                    <element name="outcome" type="diggs:MonitorResultPropertyType">
                        <annotation>
                            <documentation>A property that contains the information about what
                                properties are being measured, the results of the measurement, and
                                the associated locations that the measurement results relate
                                to.</documentation>
                        </annotation>
                    </element>
                    <element name="sensor" type="diggs:SensorPropertyType" maxOccurs="unbounded"
                        minOccurs="0"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="ReconstitutedSpecimenPreparationInfo"
        type="diggs:ReconstitutedSpecimenPreparationInfoType"
        substitutionGroup="diggs:AbstractObject">
        <annotation>
            <documentation>An object containing properties about a reconsituted specimen for
                testing.</documentation>
        </annotation>
    </element>
    <complexType name="ReconstitutedSpecimenPreparationInfoPropertyType">
        <sequence>
            <element ref="diggs:ReconstitutedSpecimenPreparationInfo"/>
        </sequence>
    </complexType>
    <complexType name="ReconstitutedSpecimenPreparationInfoType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="compactorType"
                        type="diggs:ReconstitutedSpecimenCompactorType">
                        <annotation>
                            <documentation>Type of compactor used, from an enumerated list: Drop
                                hammer, Harvard miniature, Static rod, Other: (with uncontrolled
                                string following colon).</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="numberOfLifts" type="positiveInteger">
                        <annotation>
                            <documentation>Type of compactor used, from an enumerated list: Drop
                                hammer, Harvard miniature, Static rod, Other: (with uncontrolled
                                string following colon).</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="relativeCompaction"
                        type="eml:VolumePerVolumeMeasure"/>
                    <element minOccurs="0" name="waterContentRelativeToOptimum" type="double">
                        <annotation>
                            <documentation>Water content relative to optimum water content,
                                expressed as decimal (eg. water content at optimum =
                                1)</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <simpleType name="ReconstitutedSpecimenCompactorEnumType">
        <restriction base="string">
            <enumeration value="Drop hammer"/>
            <enumeration value="Harvard miniature"/>
            <enumeration value="Static rod">
                <annotation>
                    <documentation>Short integer data value.</documentation>
                </annotation>
            </enumeration>
        </restriction>
    </simpleType>
    <simpleType name="ReconstitutedSpecimenCompactorType">
        <union memberTypes="diggs:ReconstitutedSpecimenCompactorEnumType diggs:OtherNameType"/>
    </simpleType>
    <element name="Remark" type="diggs:RemarkType" abstract="false">
        <annotation>
            <documentation>A remark or comment relevant to the containing object or feature,
                optionally including the remark's author and date.</documentation>
        </annotation>
    </element>
    <complexType name="RemarkPropertyType">
        <sequence>
            <element ref="diggs:Remark"/>
        </sequence>
    </complexType>
    <complexType name="RemarkType">
        <complexContent>
            <extension base="gml:AbstractMetadataPropertyType">
                <sequence>
                    <element name="content" type="diggs:DiggsStringType" minOccurs="1" maxOccurs="1"/>
                    <element name="author" type="diggs:BusinessAssociatePropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <appinfo>diggs:BusinessAssociate</appinfo>
                            <documentation>A property element that supports a value by reference
                                only. The target value is indicated in the appinfo
                                element.</documentation>
                        </annotation>
                    </element>
                    <element name="remarkDateTime" type="gml:TimePositionType" minOccurs="0"
                        maxOccurs="1"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="results" substitutionGroup="gml:rangeSet" type="diggs:ResultsPropertyType">
        <annotation>
            <documentation>A property that holds a ResultSet object</documentation>
        </annotation>
    </element>
    <element name="ResultSet" substitutionGroup="gml:DataBlock" type="diggs:ResultSetType">
        <annotation>
            <documentation>An object that contains properites describing the parameters and data
                values of a measurement result.</documentation>
        </annotation>
    </element>
    <complexType name="ResultSetType">
        <complexContent>
            <restriction base="gml:DataBlockType">
                <sequence>
                    <element ref="diggs:parameters" minOccurs="1"/>
                    <choice>
                        <element ref="diggs:dataValues"/>
                    </choice>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="ResultsPropertyType">
        <complexContent>
            <restriction base="gml:RangeSetType">
                <choice>
                    <!--DSB: REMOVED FROM PROFILE
        <element ref="gml:ValueArray" maxOccurs="unbounded"/>
      <element ref="gml:AbstractScalarValueList" maxOccurs="unbounded"/>
      -->
                    <element ref="diggs:ResultSet" minOccurs="1"/>
                    <!--DSB: REMOVED FROM PROFILE
        <element ref="gml:File"/>
        -->
                    <element ref="diggs:ResultFile"/>
                </choice>
            </restriction>
        </complexContent>
    </complexType>
    <element name="Role" abstract="false" type="diggs:RoleType">
        <annotation>
            <documentation>A role is the function assumed or part played by a business associate in
                relation to the containing DIGGS feature. This object also identifies the time
                interval over which the role was performed, if relevant.</documentation>
        </annotation>
    </element>
    <complexType name="RolePropertyType">
        <sequence>
            <element ref="diggs:Role" minOccurs="1" maxOccurs="1"/>
        </sequence>
    </complexType>
    <complexType name="RoleType">
        <complexContent>
            <extension base="gml:AbstractMetadataPropertyType">
                <sequence>
                    <element name="rolePerformed" type="gml:CodeType" minOccurs="1" maxOccurs="1">
                        <annotation>
                            <documentation>A term describing the role that was performed; intended to come from a controlled list of terms. In many types of practice, the rolw performed will map to a specific database field (eg. driller for a borehole) and therefore use of a a DIGGS dictionary is important to ensure interoperability berween data systems.
</documentation>
                        </annotation>
                    </element>
                    <element name="timePerformed" type="diggs:TimeIntervalPropertyType"
                        minOccurs="0" maxOccurs="1"/>
                    <element name="remark" type="diggs:RemarkPropertyType" minOccurs="0"
                        maxOccurs="unbounded"/>
                    <element name="businessAssociate" type="diggs:BusinessAssociatePropertyType"
                        maxOccurs="unbounded" minOccurs="1">
                        <annotation>
                            <appinfo>diggs:BusinessAssociate</appinfo>
                            <documentation>A property element that supports a value by reference
                                only. The target value is indicated in the appinfo
                                element.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="false" name="Sample" substitutionGroup="diggs:AbstractSample"
        type="diggs:SampleType">
        <annotation>
            <documentation>A material sample, either solid, fluid, or gas that is obtained as a
                result of a sampling activity, for the purpose of observation and/or testing. This
                is a concrete representation of AbstractSample, which serves as the head of a
                substitution group for this and other sample specialties.</documentation>
        </annotation>
    </element>
    <simpleType name="SampleFractionEnumType">
        <union memberTypes="diggs:OtherNameType diggs:FractionEnumType"/>
    </simpleType>
    <simpleType name="SampClassEnumType">
        <union memberTypes="diggs:OtherNameType diggs:SampleClassificationEnumType"/>
    </simpleType>
    <simpleType name="SampleClassificationEnumType">
        <restriction base="string">
            <enumeration value="Cement"/>
            <enumeration value="Chemical"/>
            <enumeration value="Fluid"/>
            <enumeration value="Gas"/>
            <enumeration value="Grout"/>
            <enumeration value="Rock"/>
            <enumeration value="Soil"/>
        </restriction>
    </simpleType>
    <element name="SampleGroup" substitutionGroup="diggs:AbstractGroup" type="diggs:SampleGroupType">
        <annotation>
            <documentation>A top level Diggs feature that reference related samples as part of a
                group.</documentation>
        </annotation>
    </element>
    <complexType name="SampleGroupType">
        <complexContent>
            <extension base="diggs:AbstractGroupType">
                <choice>
                    <element maxOccurs="unbounded" ref="diggs:sampleRef" minOccurs="1"/>
                </choice>
            </extension>
        </complexContent>
    </complexType>
    <element name="sampleRef" type="diggs:FractionalReferenceType">
        <annotation>
            <appinfo source="urn:x-gml:targetElement">Diggs:Sample</appinfo>
            <documentation>A reference to a sample that is associated with this feature. </documentation>
            <documentation>A property element that supports a value by reference only. The target
                value is indicated in the appinfo element.</documentation>
        </annotation>
    </element>
    <element name="SampleProduced" type="diggs:SampleProducedType"
        substitutionGroup="diggs:AbstractObject">
        <annotation>
            <documentation>An object that defines the location of a sample produced by a sampling
                activity.</documentation>
        </annotation>
    </element>
    <complexType name="SampleProducedPropertyType">
        <sequence>
            <element maxOccurs="1" ref="diggs:SampleProduced" minOccurs="1">
                <annotation>
                    <documentation>An object that contains the time and location of each physical
                        sample produced by this activity</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <complexType name="SampleProducedType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" ref="diggs:location"/>
                    <element minOccurs="0" name="sampleTime" type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The start and end time (or duration), beginning at the
                                instant of sample collection or creation, until sample is actually
                                obtained or delivered. This might include the time between coring of
                                a sample and delivery to the ground surface for boxing, or the time
                                between creation of a concrete batch until delivery to the job site.
                                This property differs from SamplingActivity/samplingDate insofar as
                                this property only is relevant to this one produced
                                sample.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="AbstractSamplePropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:AbstractSample"/>
        </sequence>
    </complexType>
    <complexType name="SampleType">
        <complexContent>
            <extension base="diggs:AbstractSampleType">
                <sequence>
                    <element name="relativeReferencingSystem"
                        type="diggs:AbstractRelativeReferenceSystemPropertyType" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>For a core or block sample, this property can be used to
                                introduce a relative spatial reference system for describing the
                                sample relative to a position on the sample instead of relative to
                                the sampling feature's origin. In this case, the linearElement
                                property of LinearSpatialReferenceSystem or
                                VectorLinearSpatialReferenceSystem would reference the sample's
                                location instead of the sampling feature's. </documentation>
                        </annotation>
                    </element>
                    <element name="relativeReferenceSystemOrigin" minOccurs="0" maxOccurs="1"
                        type="diggs:relativeReferenceSystemOriginEnumType">
                        <annotation>
                            <documentation>For a core or block sample where the vertical orientation
                                of the sample is preserved, identifies whether the origin of the
                                relative reference system (where the linear element is the sample
                                location defined in the associated SamplingActivity) occurs at the
                                top or the bottom of the sample</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="classification" type="diggs:SampClassEnumType">
                        <annotation>
                            <documentation>A definition of the class of sample collected, such as
                                soil, rock, fluid, etc.). Intended to come from a controlled
                                list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="condition" type="gml:CodeType">
                        <annotation>
                            <documentation>A description of the sample condition following collection or production; intended to come from a controlled list of terms (eg. Disturbed). This term appies to the entire sample. If a core sample has different types and intensity of disturbance along its length, this should be described as a constituent in the LithologyObservation of the sample.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="extrusionMethod" type="gml:CodeType">
                        <annotation>
                            <documentation>Method by which the sample is removed from its
                                sampler.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="initialContainer"
                        type="diggs:ContainerPropertyType">
                        <annotation>
                            <documentation/>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="purpose" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>Purpose of taking this sample. This is an uncontrolled
                                string that describes the test or tests that are intended to be run
                                on this sample.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="sampleWeight" type="eml:ForceMeasure">
                        <annotation>
                            <documentation>Weight of the sample following collection or production
                                and prior to any subsampling or specimen preparation</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="sampleVolume" type="eml:VolumeMeasure">
                        <annotation>
                            <documentation>Volume of the sample following collection or production
                                and prior to any subsampling or specimen preparation</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="sampleDimensions"
                        type="diggs:SampleDimensionsPropertyType"/>
                    <element minOccurs="0" name="sampleMatrix" type="gml:CodeType">
                        <annotation>
                            <documentation>A description of the sample matrix, if applicable. This
                                is intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="initialPreservationMethod"
                        type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>Description of methods used to preserve integrity of the
                                sample </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="chainOfCustodyEvent"
                        type="diggs:ChainOfCustodyEventPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Contains information on the chain-of-custody for the
                                sample</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="otherSampleProperty"
                        type="diggs:ParameterPropertyType"/>
                    <element minOccurs="0" name="coreDistkurbance" type="gml:CodeType">
                        <annotation>
                            <documentation>For describing a core sample of rock or soil, a description of the kind and intensity of disturbance to the core sample as a result of the sampling process. Common terms are biscuiting, fluid intrusion, drilling breccia, fractured, moderately disturbed, soupy, partial void, etc. Intended to come from a controlled list of terms.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>

    <simpleType name="relativeReferenceSystemOriginEnumType">
        <restriction base="string">
            <enumeration value="top of sample"/>
            <enumeration value="bottom of sample"/>
        </restriction>
    </simpleType>

    <element abstract="false" name="SamplingActivity"
        substitutionGroup="diggs:AbstractSamplingActivity" type="diggs:SamplingActivityType">
        <annotation>
            <documentation>The action taken to obtain or produce material samples even if the
                activity fails to produce a sample (eg. a core run that produces no recovery). The
                activity type must be specified, and indicates if the produced sample(s) are a
                result of collection at a sampling feature, sub-sampling, aggregation of two or more
                samples, or a sample created as a test or blank sample. All samples must refer to a
                SamplingActivity feature.</documentation>
        </annotation>
    </element>
    <complexType name="SamplingActivityPropertyType">
        <sequence>
            <element ref="diggs:AbstractSamplingActivity" maxOccurs="1" minOccurs="1"/>
        </sequence>
    </complexType>
    <element name="samplingActivityRef" type="diggs:FeatureReferenceType">
        <annotation>
            <appinfo source="urn:x-gml:targetElement">Diggs:SamplingActivity</appinfo>
            <documentation>A reference to a sampling activity that is associated with this feature. </documentation>
            <documentation>A property element that supports a value by reference only. The target
                value is indicated in the appinfo element.</documentation>
        </annotation>
    </element>
    <element abstract="true" name="AbstractSamplingActivity"
        type="diggs:AbstractSamplingActivityType"/>
    <complexType name="AbstractSamplingActivityType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractFeatureType">
                <sequence>
                    <element ref="diggs:investigationTarget" maxOccurs="unbounded" minOccurs="1">
                        <annotation>
                            <documentation/>
                        </annotation>
                    </element>
                    <element ref="diggs:projectRef"/>
                    <element minOccurs="0" ref="diggs:programRef"/>
                    <element minOccurs="0" ref="diggs:constructionActivityRef"/>
                    <choice>
                        <sequence>
                            <element ref="diggs:samplingFeatureRef" minOccurs="1" maxOccurs="1"/>
                            <element name="samplingLocation" type="diggs:LocationPropertyType"
                                minOccurs="1">
                                <annotation>
                                    <documentation>Geographic location of the sampling
                                        activity.</documentation>
                                </annotation>
                            </element>
                        </sequence>
                        <sequence>
                            <element maxOccurs="unbounded" minOccurs="0"
                                ref="diggs:associatedProjectRef"/>
                            <element minOccurs="0" ref="diggs:originalProjectRef"/>
                        </sequence>
                    </choice>
                    <element minOccurs="0" name="sourceSampleRef" maxOccurs="unbounded"
                        type="diggs:FractionalReferenceType">
                        <annotation>
                            <appinfo source="urn:x-gml:targetElement">diggs:Sample/@gml:id</appinfo>
                            <documentation>A reference to a sample or samples that are used to
                                create the sample(s) (identified in the sampleProduced property)
                                produced by this activity. This element is only used for activities
                                that subsample or aggregate samples from other samples. For
                                aggregate samples, the percentage attribute optionally defines how
                                much of the total new sample is composed from the source
                                sample.</documentation>
                        </annotation>
                    </element>
                    <element name="activityType" type="diggs:ActuvutyTypeEnumType">
                        <annotation>
                            <documentation>A controlled list that indicates the classification of
                                sampling activity. Can be used by applications to validate other
                                activity info. One of the following strings must be used: collect -
                                activity created a sample or samples by collection from a sampling
                                feature; aggregate - activity created a sample or samples by
                                aggregating existing samples; the associated Sample(s) should
                                contain more than one sourceSampleRef; subsample - activity created
                                a sample or samples by subsampling an existing sample; only one
                                sourceSampleRef should be specified for the related Sample(s); test
                                - activity produced a test, standard or blank sample that does not
                                relate to any field sample or sampling feature; activity will point
                                to a project but no sourceSampleRef nor samplingFeatureRef should be
                                specified for the associated Sample(s). none - the sample activity
                                failed to produce any physical sample; unknown - used where no
                                information about the sampling activity exists (eg. for legacy data
                                where only sample name or label and location (depth) exists).
                            </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="lengthLongestPortion" type="eml:LengthMeasure">
                        <annotation>
                            <documentation><![CDATA[For rock cores, the length of the longest solid, cylindrical core piece of the sample]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="purpose" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>Purpose of taking this sample. This is an uncontrolled
                                string that describes the test or tests that are intended to be run
                                on the sample(s) generated from this activity.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockQualityDesignationLength"
                        type="eml:LengthMeasure">
                        <annotation>
                            <documentation><![CDATA[For rock cores, the sum of length of core pieces that are > 100 mm (4 inches) measured along the centerline]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="samplingActivityRQD"
                        type="eml:LengthPerLengthMeasure">
                        <annotation>
                            <documentation>For rock cores, the rock quality designation for the
                                sampling activity, defined by the rockQualityDesignationLength
                                divided by the core run (length of sampling activity
                                interval)</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="sampleProduced"
                        type="diggs:SampleProducedPropertyType">
                        <annotation>
                            <documentation>Identifies the samples, and the time and location(s) of
                                samples (optional) that are produced by this sampling
                                activity</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="samplerInsertionMethod" type="gml:CodeType">
                        <annotation>
                            <documentation>For sampling of soil or rock, the means by which the
                                sampler is inserted into the ground. From a controlled list (eg.
                                pushed, driven, etc.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="samplingDate" type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The date/time that encompasses the entire time over which
                                sampling occurred.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="samplingEnvironment"
                        type="diggs:EnvironmentPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Contains a component object that is a collection of
                                environmental parameters recorded at a specific time instant dureing
                                the sampling.</documentation>
                        </annotation>
                    </element>
                    <element name="samplingEquipment" type="diggs:EquipmentPropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <appinfo>diggs:AbstractEquipment</appinfo>
                            <documentation>A property element that contains an Equipment feature (or
                                reference to one) that details the sampling equipment
                                used</documentation>
                        </annotation>
                    </element>
                    <element name="samplingMethod" type="diggs:ProcedurePropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <documentation>A property that contains a Specification object detailing
                                the method of sampling</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="solidCoreRecoveryLength" type="eml:LengthMeasure">
                        <annotation>
                            <documentation><![CDATA[For rock cores, the sum of then lengths of solid, cylindrical, core pieces]]></documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="totalSampleRecoveryLength" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>For soil or rock cores, this property is the length of
                                the total amount of sample recovered during the activity. If no
                                sample is recovered, this value is 0. This value can also be derived if totalSampleRecovery is reported.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="totalSampleRecovery"
                        type="eml:DimensionlessMeasure">
                        <annotation>
                            <documentation>A derived result for core samples from boreholes, defined by the totalSampleRecoveryLength divided by the length of the samplingActivity intervsl, typically reported as a percent.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="mixingTime" type="eml:TimeMeasure">
                        <annotation>
                            <documentation>For sampling activities that involve blending samples in
                                aggregation (such as soil-cement mixtures), this property carries
                                the time duration to mix the sample together.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0"
                        name="otherSamplingActivityProperty" type="diggs:ParameterPropertyType">
                        <annotation>
                            <documentation>A property that contains a Parameter object whereby
                                ancillary metadata about the sampling activity can be
                                reported</documentation>
                        </annotation>
                    </element>
                    <choice>
                        <element maxOccurs="1" minOccurs="0" name="coringPushPressure"
                            type="eml:PressureMeasure">
                            <annotation>
                                <documentation>For coring activities, the push pressure reported as
                                    a single value</documentation>
                            </annotation>
                        </element>
                        <sequence>
                            <element maxOccurs="1" minOccurs="0" name="coringPushPressureMin"
                                type="eml:PressureMeasure">
                                <annotation>
                                    <documentation>For reporting coring push pressure as a range,
                                        this property holds the minimum pressure
                                        value.</documentation>
                                </annotation>
                            </element>
                            <element maxOccurs="1" minOccurs="0" name="coringPushPressureMax"
                                type="eml:PressureMeasure">
                                <annotation>
                                    <documentation>For reporting coring push pressure as a range,
                                        this property holds the maximum pressure
                                        value.</documentation>
                                </annotation>
                            </element>
                        </sequence>
                    </choice>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <simpleType name="ActuvutyTypeEnumType">
        <restriction base="string">
            <enumeration value="aggregate"/>
            <enumeration value="collect"/>
            <enumeration value="none"/>
            <enumeration value="subsample"/>
            <enumeration value="test"/>
            <enumeration value="unknown"/>
        </restriction>
    </simpleType>
    <complexType name="SamplingActivityType">
        <complexContent>
            <extension base="diggs:AbstractSamplingActivityType">
                <sequence/>
            </extension>
        </complexContent>
    </complexType>
    <element name="SampleDimensions" type="diggs:SampleDimensionsType"
        substitutionGroup="diggs:AbstractComponentObjectBase">
        <annotation>
            <documentation>For solid soil or rock samples, contains properties on the sample
                dimensions </documentation>
        </annotation>
    </element>
    <complexType name="SampleDimensionsType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element name="remark" type="diggs:RemarkPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="diameter" type="eml:LengthMeasure">
                        <annotation>
                            <documentation><![CDATA[For core or cylindrical samples, the diameter of the sample]]></documentation>
                        </annotation>
                    </element>
                    <element name="height" type="eml:LengthMeasure" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>For block samples, the length of one of the sides of the
                                block measured normal to the sampling direction</documentation>
                        </annotation>
                    </element>
                    <element name="length" type="eml:LengthMeasure" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>For block or core samples, the length of the sample
                                measured in the sampling direction (eg. core length or length of
                                block sample as measured between the top and base of the sampling
                                interval)</documentation>
                        </annotation>
                    </element>
                    <element name="width" type="eml:LengthMeasure" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>For block samples, the length of one of the sides of the
                                block measured normal to the sampling direction</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="SampleDimensionsPropertyType">
        <sequence>
            <element ref="diggs:SampleDimensions"/>
        </sequence>
    </complexType>
    <element name="SamplingFeatureGroup" substitutionGroup="diggs:AbstractGroup"
        type="diggs:SamplingFeatureGroupType">
        <annotation>
            <documentation>A top-level Diggs feature that references associated sampling features
                within a group</documentation>
        </annotation>
    </element>
    <complexType name="SamplingFeatureGroupType">
        <complexContent>
            <extension base="diggs:AbstractGroupType">
                <choice>
                    <element maxOccurs="unbounded" ref="diggs:samplingFeatureRef" minOccurs="1"/>
                </choice>
            </extension>
        </complexContent>
    </complexType>
    <element name="samplingFeatureRef" type="diggs:FeatureReferenceType">
        <annotation>
            <appinfo source="urn:x-gml:targetElement">Diggs:AbstractConstructionActivity</appinfo>
            <documentation>A reference to a sampling feature from which data are obtained or in
                which an activity occurs.</documentation>
            <documentation>A property element that supports a value by reference only. The target
                value is indicated in the appinfo element.</documentation>
        </annotation>
    </element>
    <element name="Sensor" type="diggs:SensorType" substitutionGroup="diggs:AbstractSensor"
        abstract="false">
        <annotation>
            <documentation>An instrument used to take readings as part of a measurement. A sensor
                inherits from AbstractEquipment and may be assigned to a location via a coordinate
                or by a text description. In addition, a sensor can also have one or more detectors,
                each of which can also be assigned a location, plus a measurand, and a measiurement
                axis orientation.</documentation>
        </annotation>
    </element>
    <element name="sensorRef" type="diggs:FeatureReferenceType">
        <annotation>
            <documentation>A reference to a sensor that is associated with this feature. </documentation>
            <documentation>A property element that supports a value by reference only. The target
                value is indicated in the appinfo element.</documentation>
        </annotation>
    </element>
    <complexType name="SensorPropertyType">
        <sequence>
            <element ref="diggs:Sensor" minOccurs="1" maxOccurs="1"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <complexType name="AbstractSensorPropertyType">
        <sequence>
            <element ref="diggs:AbstractSensor" minOccurs="1" maxOccurs="1"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <element name="AbstractSensor" substitutionGroup="diggs:AbstractEquipment"
        type="diggs:AbstractSensorType"/>
    <complexType name="AbstractSensorType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractEquipmentType">
                <sequence>
                    <element minOccurs="0" name="referencePoint"
                        type="diggs:PointLocationPropertyType">
                        <annotation>
                            <documentation>Identifies the reference point location for the sensor.
                                This may be the top of casing for a tape used to detect water level
                                or it could be a location within the response zone
                                itself.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="dateInstalled"
                        type="diggs:TimeIntervalPropertyType"/>
                    <element name="detector" type="diggs:DetectorPropertyType" minOccurs="0"
                        maxOccurs="unbounded"/>
                </sequence>
                <attributeGroup ref="gml:AssociationAttributeGroup"/>
                <attributeGroup ref="gml:OwnershipAttributeGroup"/>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="SensorType">
        <complexContent>
            <extension base="diggs:AbstractSensorType">
                <sequence/>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="SimpleMultiPointType">
        <complexContent>
            <extension base="diggs:AbstractGeometricAggregateType">
                <sequence>
                    <element ref="gml:posList"/>
                    <element minOccurs="0" name="uncertainty"
                        type="diggs:LocationUncertaintyPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="SizeFraction" type="diggs:SizeFractionType">
        <annotation>
            <documentation>The range of grain sizes used for this test procedure; expressed as
                minimum grain size (for a sample with grain sizes above a certain size), or maximum
                grain size (for a sample with grain sizes below a certain). Both minimumGrainSize
                and maximumGrainSize may be populated to represent a sample with grain sizes between
                the two specified.</documentation>
        </annotation>
    </element>
    <complexType name="SizeFractionPropertyType">
        <annotation>
            <documentation/>
        </annotation>
        <sequence>
            <element ref="diggs:SizeFraction"/>
        </sequence>
    </complexType>
    <complexType name="SizeFractionType">
        <annotation>
            <documentation/>
        </annotation>
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="minimumGrainSize"
                        type="diggs:ParticleSizeValueType">
                        <annotation>
                            <documentation>The smallest grain size in the sample fraction used for
                                this procedure</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="maximumGrainSize"
                        type="diggs:ParticleSizeValueType">
                        <annotation>
                            <documentation>The largest grain size in the sample fraction used for
                                this procedure</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="percentOfTotalSample"
                        type="eml:VolumePerVolumeMeasure">
                        <annotation>
                            <documentation>The fraction of the total sample used for the procedure
                                (eg. fraction of the total sample represented by the size fraction
                                used for the procedure</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="SoftwareApplication" type="diggs:SoftwareApplicationType"
        substitutionGroup="diggs:AbstractNamedObject" abstract="false">
        <annotation>
            <documentation>A computer program designed to carry out a specific task other than one
                relating to the operation of the computer itself.</documentation>
        </annotation>
    </element>
    <complexType name="SoftwareApplicationPropertyType">
        <sequence>
            <element ref="diggs:SoftwareApplication" minOccurs="1" maxOccurs="1"/>
        </sequence>
    </complexType>
    <complexType name="SoftwareApplicationType">
        <complexContent>
            <extension base="diggs:AbstractNamedObjectType">
                <sequence>
                    <element name="version" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1"
                    />
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="false" name="Sounding"
        substitutionGroup="diggs:AbstractLinearSamplingFeature" type="diggs:SoundingType">
        <annotation>
            <documentation>A sampling feature that is created by a measurement or construction
                activity through insertion of a probe or toolinto the ground. </documentation>
        </annotation>
    </element>
    <element name="SoundingConstructionMethod" type="diggs:SoundingConstructionMethodType">
        <annotation>
            <documentation>An object that contains properties of the construction of a sounding
                sampling feature.</documentation>
        </annotation>
    </element>
    <complexType name="SoundingConstructionMethodPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:SoundingConstructionMethod"/>
        </sequence>
    </complexType>
    <complexType name="SoundingConstructionMethodType">
        <complexContent>
            <extension base="diggs:AbstractNamedRoleObjectType">
                <sequence>
                    <element minOccurs="0" ref="diggs:location">
                        <annotation>
                            <documentation>The location within the sampling feature that corresponds
                                to the particular construction method being referenced here. If
                                omitted, it is assumed that the procedures specified apply to the
                                entire extent of the sampling feature</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="methodTime"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The period of time during which the construction event is
                                occurring</documentation>
                        </annotation>
                    </element>
                    <element name="constructionMethod" type="diggs:SpecificationPropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <documentation>Properties describing the method by which the borehole is
                                constructed over this location interval</documentation>
                        </annotation>
                    </element>
                    <element name="constructionEquipment" type="diggs:EquipmentPropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <documentation>A property element that contains an Equipment feature (or
                                reference to one) that details the construction equipment
                                used.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="SoundingEvent" type="diggs:SoundingEventType"
        substitutionGroup="diggs:AbstractEvent">
        <annotation>
            <documentation>An object that contains properties describing a location or time based
                event that occurs during contstruction of a sounding sampling
                feature.</documentation>
        </annotation>
    </element>
    <complexType name="SoundingEventPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:SoundingEvent"/>
        </sequence>
    </complexType>
    <complexType name="SoundingEventType">
        <complexContent>
            <extension base="diggs:AbstractEventType">
                <sequence>
                    <element minOccurs="0" name="casingBottom"
                        type="diggs:PointLocationPropertyType">
                        <annotation>
                            <documentation>Measured Depth to Base of Casing installed at this event
                                time, in the sounding's linear referencing system. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="soundingBottom"
                        type="diggs:PointLocationPropertyType">
                        <annotation>
                            <documentation>Measured Depth to Base of the sounding at this event
                                time, reported in the sounding's linear referencing
                                system.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="SoundingType">
        <complexContent>
            <extension base="diggs:AbstractLinearSamplingFeatureType">
                <sequence>
                    <element maxOccurs="1" minOccurs="0" name="whenConstructed"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The period of time when the sounding is constructed. This
                                should include the entire time the drill rig is on
                                site.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="totalMeasuredDepth" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The measured depth to the bottom of the hole, measured in
                                a hole's linear referencing system.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="soundingPurpose" type="gml:CodeType">
                        <annotation>
                            <documentation>A description of the purpose for the sounding. Intended
                                to come from a controlled list (eg. CPT, Flat Dilatometer,
                                etc).</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="backfill" type="diggs:BackfillPropertyType">
                        <annotation>
                            <documentation>Information on construction of the backfill after the
                                sounding is made.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="casing" type="diggs:CasingPropertyType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on the casing installed following or during
                                the sounding</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="constructionMethod"
                        type="diggs:SoundingConstructionMethodPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information regarding construction of the sounding over
                                different depth intervals</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="constructionEvent"
                        type="diggs:SoundingEventPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on sounding construction events with
                                time.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Specification" type="diggs:SpecificationType"
        substitutionGroup="diggs:AbstractProcedure" abstract="false">
        <annotation>
            <documentation>An object that describes the specification or method used for testing or
                construction. It is used where the the procedure has no other metadata property
                other than a description and classification of methods. The gml:name property should
                contain the full name of the test specification or procedure used, whereas
                shortMethodName can be used to describe solely a method abbreviation - eg. ASTM
                D2487 as informative. Non-standardized specifications should be described under the
                gml:description property or within the optional properties.</documentation>
        </annotation>
    </element>
    <complexType name="SpecificationPropertyType">
        <sequence>
            <element ref="diggs:Specification" maxOccurs="1" minOccurs="0"> </element>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <complexType name="SpecificationType">
        <complexContent>
            <extension base="diggs:AbstractProcedureType">
                <sequence>
                    <element name="accredtingBody" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>Identification of the accreditng body and reference
                                number, if applicable.</documentation>
                        </annotation>
                    </element>
                    <element name="shortMethodName" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1"/>
                    <element name="standardClause" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1"/>
                    <element name="standardPart" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1"/>
                    <element name="standardReferenceNumber" type="diggs:DiggsStringType"
                        minOccurs="0" maxOccurs="1"/>
                    <element name="standardTitle" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1"/>
                    <element name="standardVersion" type="diggs:DiggsStringType" minOccurs="0"
                        maxOccurs="1"/>
                    <element maxOccurs="unbounded" minOccurs="0" name="otherSpecificationProperty"
                        type="diggs:ParameterPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="SpecificGravityMeasureType">
        <simpleContent>
            <extension base="diggs:DescriptorValueType">
                <attribute name="waterTemperature" type="string"/>
            </extension>
        </simpleContent>
    </complexType>
    <element name="SoilSpecimen" type="diggs:SoilSpecimenType"
        substitutionGroup="diggs:AbstractSpecimen">
        <annotation>
            <documentation>A specialization of a specimen that describes the physical conditions of
                a soil sample or samples subjected to testing.</documentation>
        </annotation>
    </element>
    <complexType name="SoilSpecimenType">
        <complexContent>
            <extension base="diggs:AbstractSpecimenType">
                <sequence>
                    <element minOccurs="0" name="conditionPreTest"
                        type="diggs:SpecimenConditionsPropertyType">
                        <annotation>
                            <documentation>Describes the physical conditions of the sample
                                pre-test</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="conditionIntermediate"
                        type="diggs:SpecimenConditionsPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Describes the physical conditions of the specimen at an
                                intermediate stage during the test.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="conditionPostTest"
                        type="diggs:SpecimenConditionsPropertyType">
                        <annotation>
                            <documentation>Describes the physical conditions of the specimen
                                post-test. For triaxial tests, this condition is used to report
                                specimen conditions following consolidation stage.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="intactSpecimenPreparationInfo"
                        type="diggs:IntactSpecimenPreparationInfoPropertyType">
                        <annotation>
                            <documentation>Provides information on preparation of intact specimens,
                                such as whether and how specimen was trimmed for
                                testing</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="reconstitutedSpecimenPreparationInfo"
                        type="diggs:ReconstitutedSpecimenPreparationInfoPropertyType">
                        <annotation>
                            <documentation>Provides information on the preparation of reconstituted
                                samples (eg. number of lifts, compactor type, etc.)</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="sizeFraction" type="diggs:SizeFractionPropertyType">
                        <annotation>
                            <documentation>For soil speciments, size fraction from which test
                                portion was obtained</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="specificGravityOfSolids"
                        type="diggs:SpecificGravityMeasureType">
                        <annotation>
                            <documentation>Specific gravity of soil solids (Gs) is the ratio of the
                                density of a substance to the density of a reference substance,
                                usually water at 4 deg C; equivalently, it is the ratio of the mass
                                of a substance to the mass of a reference substance for the same
                                given volume.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="specimenType" type="diggs:SpecimenTypeType">
                        <annotation>
                            <documentation>The structural condition of the soil specimen being
                                tested, defined by the following controlled terms: 1) intact -
                                specimen prepared without disturbance from an "undisturbed" sample
                                (eg. thin-walled sampler); 2) disturbed - specimen prepared from a
                                disturbed sample (eg. thick walled sampler; 3) remolded - specimen
                                prepared from a failed or otherwise disturbed intact specimen; 4)
                                reconstituted - specimen prepared to a predetermined water content
                                and density</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="RockSpecimen" type="diggs:RockSpecimenType"
        substitutionGroup="diggs:AbstractSpecimen">
        <annotation>
            <documentation>A specialization of a specimen that describes the physical conditions of
                a rock sample or samples subjected to testing.</documentation>
        </annotation>
    </element>
    <complexType name="RockSpecimenType">
        <complexContent>
            <extension base="diggs:AbstractSpecimenType">
                <sequence>
                    <element minOccurs="0" name="conditionPreTest"
                        type="diggs:SpecimenConditionsPropertyType">
                        <annotation>
                            <documentation>Describes the physical conditions of the specimen
                                pre-test</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="conditionIntermediate"
                        type="diggs:SpecimenConditionsPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Describes the physical conditions of the specimen at an
                                intermediate stage during the test.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="conditionPostTest"
                        type="diggs:SpecimenConditionsPropertyType">
                        <annotation>
                            <documentation>Describes the physical conditions of the specimen
                                post-test. For triaxial tests, this condition is used to report
                                specimen conditions following consolidation stage.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="SpecimenConditions" type="diggs:SpecimenConditionsType">
        <annotation>
            <documentation>An object that describes the physical conditions of a specimen subjected
                to testing</documentation>
        </annotation>
    </element>
    <complexType name="SpecimenConditionsType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="dateTime" nillable="false"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>Date and (optionally) time or interval of time during
                                which this specimen condition evaluation was made.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="index" nillable="false" type="positiveInteger">
                        <annotation>
                            <documentation>Used for intermediate evaluations of specimen condition;
                                indicates the order of the intermediate measurements, in index order
                                (eg. 1, 2, 3 etc.)</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="bulkUnitWeight"
                        type="diggs:DensityOrUnitWeightMeasureType">
                        <annotation>
                            <documentation>Initial bulk density or unit weight</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="crossSectionalArea" type="eml:AreaMeasure">
                        <annotation>
                            <documentation>The cross-sectional area of the specimen. Specific
                                methods for computing this value may be given in the associated test
                                procedure object.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="dimensionMeasurementTechnique"
                        type="diggs:DimensionMeasurementTechniqueType">
                        <annotation>
                            <documentation>Technique used to measure specimen lengths and diameters.
                                Enumerated list. - 1) Calipers, 2) PI-tape, 3) Other: (uncontrolled
                                string after colon)</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="dryUnitWeight"
                        type="diggs:DensityOrUnitWeightMeasureType">
                        <annotation>
                            <documentation>Dry density or unit weight of the
                                specimen</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="dryWeight" type="eml:ForceMeasure">
                        <annotation>
                            <documentation>The weight of the specimen following
                                drying</documentation>
                        </annotation>
                    </element>
                    <choice minOccurs="0">
                        <element minOccurs="0" name="diameter" type="eml:LengthMeasure">
                            <annotation>
                                <documentation>For cylindrical specimens, a measure of the
                                    cylinder's diameter</documentation>
                            </annotation>
                        </element>
                        <sequence minOccurs="0">
                            <element minOccurs="0" name="length" type="eml:LengthMeasure">
                                <annotation>
                                    <documentation>A measure of one of the cross-sectional, or
                                        horizontal, dimensions of the prepared
                                        sample.</documentation>
                                </annotation>
                            </element>
                            <element minOccurs="0" name="width" type="eml:LengthMeasure">
                                <annotation>
                                    <documentation>A measure of the other of the cross-sectional, or
                                        horizontal, dimensions of the prepared
                                        sample</documentation>
                                </annotation>
                            </element>
                        </sequence>
                    </choice>
                    <element minOccurs="0" name="height" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The vertical dimension of the specimen</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="percentSaturation"
                        type="eml:VolumePerVolumeMeasure"/>
                    <element minOccurs="0" name="shape" type="diggs:SpecimenShapeType">
                        <annotation>
                            <documentation>The shape of the specimen being tested, defined by the
                                following controlled terms: 1) cylinder; 2) cube 3) cuboid - a
                                square cylinder or cube with uneven sides; 4) non-solid - sample is
                                a paste, liquid, or gas with no defined shape; 5)
                                sphere</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="surfaceArea" type="eml:AreaMeasure">
                        <annotation>
                            <documentation>The total surface area of the specimen, computed in
                                various ways dependent on specimen shape.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="temperature"
                        type="diggs:TemperatureMeasurementPropertyType">
                        <annotation>
                            <documentation>Temperature of the specimen, stored in the
                                TemperatureMeasurement object with optional dateTime that identifies
                                specific time instant for the measurement. Multiple temperature
                                measurements are permitted.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="volume" type="eml:VolumeMeasure">
                        <annotation>
                            <documentation/>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="waterContent" type="diggs:WaterContentMeasureType"/>
                    <element minOccurs="0" name="wetWeight" type="eml:ForceMeasure">
                        <annotation>
                            <documentation>The weight of the sample prior to drying.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="voidRatio" type="double">
                        <annotation>
                            <documentation>Void ratio (for soils) is defined as the volume of voids
                                divided by the volume of solids</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="otherConditionProperty"
                        type="diggs:ParameterPropertyType" maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="SpecimenConditionsPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:SpecimenConditions"/>
        </sequence>
    </complexType>
    <element name="GroutSpecimenConditions" type="diggs:GroutSpecimenConditionsType">
        <annotation>
            <documentation>An object that describes the physical conditions of a specimen subjected
                to testing</documentation>
        </annotation>
    </element>
    <complexType name="GroutSpecimenConditionsType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="dateTime" nillable="false"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>Date and (optionally) time or interval of time during
                                which this specimen condition evaluation was made.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="bulkUnitWeight"
                        type="diggs:DensityOrUnitWeightMeasureType">
                        <annotation>
                            <documentation>Initial bulk density or unit weight</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="specimenPlumb" type="boolean">
                        <annotation>
                            <documentation>If true, specimen formed in mold has vertical and/or
                                horizontal sides. Any slumping of specimen after extracting from
                                mold should have this property set as false.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="dimensionMeasurementTechnique"
                        type="diggs:DimensionMeasurementTechniqueType">
                        <annotation>
                            <documentation>Technique used to measure specimen lengths and diameters.
                                Enumerated list. - 1) Calipers, 2) PI-tape, 3) Other: (uncontrolled
                                string after colon)</documentation>
                        </annotation>
                    </element>
                    <choice minOccurs="0">
                        <element minOccurs="0" name="diameter" type="eml:LengthMeasure">
                            <annotation>
                                <documentation>For cylindrical specimens, a measure of the
                                    cylinder's diameter</documentation>
                            </annotation>
                        </element>
                        <sequence minOccurs="0">
                            <element minOccurs="0" name="length" type="eml:LengthMeasure">
                                <annotation>
                                    <documentation>A measure of one of the cross-sectional, or
                                        horizontal, dimensions of the prepared
                                        sample.</documentation>
                                </annotation>
                            </element>
                            <element minOccurs="0" name="width" type="eml:LengthMeasure">
                                <annotation>
                                    <documentation>A measure of the other of the cross-sectional, or
                                        horizontal, dimensions of the prepared
                                        sample</documentation>
                                </annotation>
                            </element>
                        </sequence>
                    </choice>
                    <element minOccurs="0" name="height" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The vertical dimension of the specimen</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="shape" type="diggs:SpecimenShapeType">
                        <annotation>
                            <documentation>The shape of the specimen being tested, defined by the
                                following controlled terms: 1) cylinder; 2) cube 3) cuboid - a
                                square cylinder or cube with uneven sides; 4) non-solid - sample is
                                a paste, liquid, or gas with no defined shape; 5)
                                sphere</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="surfaceArea" type="eml:AreaMeasure">
                        <annotation>
                            <documentation>The total surface area of the specimen, computed in
                                various ways dependent on specimen shape.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="temperature"
                        type="diggs:TemperatureMeasurementPropertyType">
                        <annotation>
                            <documentation>Temperature of the specimen, stored in the
                                TemperatureMeasurement object with optional dateTime that identifies
                                specific time instant for the measurement. Multiple temperature
                                measurements are permitted.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="volume" type="eml:VolumeMeasure">
                        <annotation>
                            <documentation>The volume of the specimen.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="wetWeight" type="eml:ForceMeasure">
                        <annotation>
                            <documentation>The weight of the specimen prior to
                                drying.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="wtBleedWater" type="eml:ForceMeasure">
                        <annotation>
                            <documentation>The weight of bleed water that occurs during curing,
                                generally determined by weighing the specimen before and after
                                draining the bleed water off the sample. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="otherConditionProperty"
                        type="diggs:ParameterPropertyType" maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="GroutSpecimenConditionsPropertyType">
        <sequence>
            <element ref="diggs:GroutSpecimenConditions"/>
        </sequence>
    </complexType>
    <simpleType name="SpecimenEnumType">
        <restriction base="string">
            <enumeration value="intact"/>
            <enumeration value="disturbed"/>
            <enumeration value="remolded"/>
            <enumeration value="reconstituted"/>
        </restriction>
    </simpleType>
    <complexType name="SpecimenPropertyType">
        <sequence minOccurs="0">
            <element maxOccurs="1" minOccurs="1" ref="diggs:AbstractSpecimen"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <element name="specimenRef" type="diggs:FeatureReferenceType">
        <annotation>
            <appinfo source="urn:x-gml:targetElement">diggs:AbstractSpecimen</appinfo>
            <documentation>A reference to a test specimen</documentation>
            <documentation>A property element that supports a value by reference only. The target
                value is indicated in the appinfo element.</documentation>
        </annotation>
    </element>
    <simpleType name="SpecimenShapeEnumType">
        <restriction base="string">
            <enumeration value="cylinder"/>
            <enumeration value="cube"/>
            <enumeration value="cuboid"/>
            <enumeration value="non-solid"/>
            <enumeration value="sphere"/>
        </restriction>
    </simpleType>
    <simpleType name="SpecimenShapeType">
        <union memberTypes="diggs:OtherNameType diggs:SpecimenShapeEnumType"/>
    </simpleType>
    <simpleType name="SpecimenTypeType">
        <union memberTypes="diggs:OtherNameType diggs:SpecimenEnumType"/>
    </simpleType>
    <element name="Station" type="diggs:StationType" abstract="false"
        substitutionGroup="diggs:AbstractPointSamplingFeature">
        <annotation>
            <documentation>A sampling feature that is a point in or on the earth's surface where
                observations or tests are performed, where samples are collected, or where
                monitoring devices are installed.</documentation>
        </annotation>
    </element>
    <complexType name="StationType">
        <complexContent>
            <extension base="diggs:AbstractPointSamplingFeatureType">
                <sequence>
                    <element name="type" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A definition of the type of station (eg. outcrop, survey
                                marker, etc.). This is intended to come from a list controlled by an
                                authority. </documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="PercentPerTimeMeasureType">
        <simpleContent>
            <extension base="eml:AbstractMeasure">
                <attribute name="uom" type="diggs:percentPerTimeUom"/>
            </extension>
        </simpleContent>
    </complexType>
    <simpleType name="percentPerTimeUom">
        <restriction base="eml:UomEnum">
            <enumeration value="%/hr"/>
            <enumeration value="%/min"/>
            <enumeration value="%/sec"/>
            <enumeration value="%/day"/>
            <enumeration value="%/month"/>
            <enumeration value="%/year"/>
            <enumeration value="%/kyr"/>
        </restriction>
    </simpleType>
    <element name="StratigraphyObservation" substitutionGroup="diggs:AbstractObservation"
        type="diggs:StratigraphyObservationType">
        <annotation>
            <documentation>Stratigraphy obsrvations are descriptions of ordered bodies of rock or
                soil, such as formations, biostratigraphic units or aquifers. </documentation>
        </annotation>
    </element>
    <complexType name="StratigraphyObservationPropertyType">
        <sequence maxOccurs="1">
            <element maxOccurs="1" ref="diggs:StratigraphyObservation"/>
        </sequence>
    </complexType>
    <complexType name="StratigraphyObservationType">
        <complexContent>
            <extension base="diggs:AbstractObservationType">
                <sequence>
                    <element name="stratigraphicUnitName" type="gml:CodeType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>The name of the stratigraphic unit (eg. Harold Formation)
                                assigned to this zone. Should come from a controlled list based on
                                the subtype of the layer system.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="stratigraphicUnitDescription"
                        type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>An optional description of the named stratigraphic
                                unit</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="unitType" type="diggs:StratUnitExtEnumType"/>
                    <element maxOccurs="unbounded" minOccurs="0" ref="diggs:placedObservation"/>
                    <element minOccurs="0" ref="diggs:baseBoundary">
                        <annotation>
                            <documentation>Description of the boundary at the base of the observed
                                zone or interval as defined in the observation's location
                                property</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="StratigraphySystem" substitutionGroup="diggs:AbstractObservationSystem"
        type="diggs:StratigraphySystemType">
        <annotation>
            <documentation>An object containing a system of stratrigraphy observations. Observations
                within a stratigraphy system must not overlap, and stratUnit values within a system
                cannot repeat (eg. they must be unique within the system. </documentation>
        </annotation>
    </element>
    <complexType name="StratigraphySystemType">
        <complexContent>
            <extension base="diggs:AbstractObservationSystemType">
                <sequence>
                    <element name="stratigraphyType" type="diggs:StratUnitExtEnumType">
                        <annotation>
                            <documentation>Selected from an enumerated list, the type of
                                stratigraphic units described in this system. Where there may be
                                different strat unit definitions within a system (rare), the
                                dominant type should be listed here and the unitType property of
                                each StratigraphyObservation may be instantiated to identify which
                                observation falls within each type of unit.</documentation>
                        </annotation>
                    </element>
                    <element name="stratigraphyObservation"
                        type="diggs:StratigraphyObservationPropertyType" maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="GeoUnitSystem" substitutionGroup="diggs:AbstractObservationSystem"
        type="diggs:GeoUnitSystemType">
        <annotation>
            <documentation>An object containing a system of geostechnical unit observations.
                Observations. Geotechnical units are bodies of earth material distinguished by one
                or more characteristic engineering properties. Observations within a geounit system
                must not overlap.</documentation>
        </annotation>
    </element>
    <complexType name="GeoUnitSystemType">
        <complexContent>
            <extension base="diggs:AbstractObservationSystemType">
                <sequence>
                    <element name="geoUnitType" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A type or class designation for the GeoUnit. Optional,
                                intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element name="geoUnitObservation" type="diggs:GeoUnitObservationPropertyType"
                        maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="TemperatureMeasurement" substitutionGroup="diggs:AbstractObject"
        type="diggs:TemperatureMeasurementType">
        <annotation>
            <documentation>A temperature measurement optionally taken at a specific time
                instant.</documentation>
        </annotation>
    </element>
    <complexType name="TemperatureMeasurementPropertyType">
        <sequence>
            <element ref="diggs:TemperatureMeasurement"/>
        </sequence>
    </complexType>
    <complexType name="TemperatureMeasurementType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="dateTime" type="gml:TimePositionType"/>
                    <element minOccurs="1" name="temperature"
                        type="eml:ThermodynamicTemperatureMeasure"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Test" type="diggs:TestType" substitutionGroup="diggs:AbstractMeasurement">
        <annotation>
            <documentation>An act ("event"), whose results are estimates of the value of a property
                of the investigation target, measured at a time instant or within a time interval,
                and within a spatial domain, typically derived from a test
                procedure.</documentation>
        </annotation>
    </element>
    <element name="TestResult" substitutionGroup="gml:AbstractCoverage" type="diggs:TestResultType">
        <annotation>
            <documentation>An object that contains properties that report the results of a
                test.</documentation>
        </annotation>
    </element>
    <complexType name="TestResultPropertyType">
        <choice>
            <element ref="diggs:TestResult"/>
            <element ref="diggs:MonitorResult"/>
        </choice>
    </complexType>
    <complexType name="TestResultBaseType">
        <complexContent>
            <restriction base="gml:AbstractCoverageType">
                <sequence>
                    <element ref="diggs:location"/>
                    <element minOccurs="1" ref="diggs:results"/>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="TestResultType">
        <complexContent>
            <extension base="diggs:TestResultBaseType">
                <sequence>
                    <element minOccurs="0" ref="diggs:gridMappingFunction"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="TestType">
        <complexContent>
            <extension base="diggs:AbstractMeasurementType">
                <sequence>
                    <element minOccurs="0" name="samplingTime"
                        type="diggs:TimeIntervalOrInstantPropertyType">
                        <annotation>
                            <documentation>Describes the time that the result applies to the
                                property of the investigation target. This is often the time of
                                interaction by a sampling activity or measurement procedure with a
                                real-world feature. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="resultTime"
                        type="diggs:TimeIntervalOrInstantPropertyType">
                        <annotation>
                            <documentation>Describes the time when the result became available,
                                typically when the procedure associated with the observation was
                                completed. For some observations this is identical to the
                                samplingTime. However, there are important cases where they differ.
                                Example: Where a measurement is made on a specimen in a laboratory,
                                the samplingTime should record the time the specimen was retrieved
                                from its host, while the resultTime should record the time the
                                laboratory procedure was applied. Example: Where monitoring
                                observation results are post-processed, the resultTime is the
                                post-processing time, while the samplingTime preserves the time of
                                initial interaction with the world. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="validTime"
                        type="diggs:TimeIntervalOrInstantPropertyType">
                        <annotation>
                            <documentation>Describes the time period during which the result is
                                intended to be used.</documentation>
                        </annotation>
                    </element>
                    <element name="outcome" type="diggs:TestResultPropertyType">
                        <annotation>
                            <documentation>A property that contains the information about what
                                properties are being measured, the results of the measurement, and
                                the associated locations that the measurement results relate
                                to.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="procedure" type="diggs:TestProcedurePropertyType"
                        maxOccurs="unbounded"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="ResultFile" type="diggs:ResultFileType" substitutionGroup="gml:File">
        <annotation>
            <documentation>for efficiency reasons, DIGGS also provides a means of encoding the
                ResultSet in an arbitrary external encoding, such as a binary file. This encoding
                may be "well-known" but this is not required. This mode uses the diggs:ResultFile
                element. The values in the dataValues element of the measurement are transmitted in
                a external file that is referenced from the XML structure described by
                diggs:ResultFileType. The external file is referenced by the diggs:fileReference
                property that is an anyURI This means that the external file may be located remotely
                from the referencing DIGGS instance. The diggs:compression property points to a
                definition of a compression algorithm through an anyURI. This may be a retrievable,
                computable definition or simply a reference to an unambiguous name for the
                compression method. The diggs:mimeType property points to a definition of the file
                mime type. The diggs:fileStructure property is defined by a codelist, but should be
                "Record Interleaved" to preserve the required structure of the dataValues property,
                whereby each record contains a set of fields in parameter order, with each record in
                document order associated with a value, in order, in the location or timeDomain
                property of the measurement. Note that if any compression algorithm is applied, the
                structure above applies only to the pre-compression or post-decompression structure
                of the file. </documentation>
        </annotation>
    </element>
    <complexType name="ResultFileBaseType">
        <complexContent>
            <restriction base="gml:FileType">
                <sequence>
                    <element ref="diggs:parameters"/>
                    <!-- Replace with global elements to allow for restriction 
      <choice>
        <element name="fileName" type="anyURI">
          <annotation>
            <appinfo>deprecated</appinfo>
          </annotation>
        </element>
        <element name="fileReference" type="anyURI"/>
      </choice>
      <element name="fileStructure" type="gml:CodeType"/>
      <element name="mimeType" type="diggs:mimeTypeEnumExtType" minOccurs="0"/>
      <element name="compression" type="anyURI" minOccurs="0"/>
      -->
                    <choice>
                        <element ref="diggs:fileReference"/>
                    </choice>
                    <element minOccurs="1" ref="diggs:fileStructure"/>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="ResultFileType">
        <complexContent>
            <extension base="diggs:ResultFileBaseType">
                <sequence>
                    <element minOccurs="0" name="mimeType" type="diggs:mimeTypeEnumExtType"/>
                    <element minOccurs="0" name="compression" type="anyURI"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="fileReference" substitutionGroup="gml:fileReference" type="anyURI">
        <annotation>
            <documentation>A URL to the file's location</documentation>
        </annotation>
    </element>
    <element name="fileStructure" substitutionGroup="gml:fileStructure" type="gml:CodeType">
        <annotation>
            <documentation>A controlled term describing how the file is structured (eg. Record Interleaved)</documentation>
        </annotation>
    </element>
    <complexType name="TimeIntervalOrInstantPropertyType">
        <choice>
            <element minOccurs="1" ref="diggs:TimeInterval"/>
            <element ref="gml:TimeInstant"/>
        </choice>
    </complexType>
    <complexType name="TimeArrayPropertyType">
        <sequence maxOccurs="1" minOccurs="1">
            <element ref="gml:TimeInstant"/>
        </sequence>
    </complexType>
    <element name="timeDomain" type="diggs:TimeDomainType" substitutionGroup="gml:domainSet">
        <annotation>
            <documentation>A property that holds the time instances for the time domain of a
                monitoring activity.</documentation>
        </annotation>
    </element>
    <complexType name="TimeDomainType">
        <complexContent>
            <restriction base="gml:DomainSetType">
                <sequence minOccurs="0">
                    <choice>
                        <element ref="diggs:AbstractTimeObject"/>
                    </choice>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <element name="TimeInterval" type="diggs:TimeIntervalType">
        <annotation>
            <documentation>An interval of time, expressed by a start and end time, or optionally as
                a start time, end time and/or duration.</documentation>
        </annotation>
    </element>
    <complexType name="TimeIntervalPropertyType">
        <sequence>
            <element ref="diggs:TimeInterval"/>
        </sequence>
    </complexType>
    <complexType name="TimeIntervalType">
        <annotation>
            <documentation/>
        </annotation>
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element name="start" type="gml:TimePositionType" maxOccurs="1" minOccurs="1">
                        <annotation>
                            <documentation>The date/time that begins the interval </documentation>
                        </annotation>
                    </element>
                    <element name="end" type="gml:TimePositionType" maxOccurs="1" minOccurs="0">
                        <annotation>
                            <documentation>The date/time that ends the interval. Alternatively, the
                                duration property may be used to define the time interval of
                                interest.</documentation>
                        </annotation>
                    </element>
                    <element name="duration" type="eml:TimeMeasure" maxOccurs="1" minOccurs="0">
                        <annotation>
                            <documentation>The duration of time since start, defining the time
                                interval of interest. Both end and duration are allowed and could
                                produce different time intervals depending on the nature of the
                                activity or commentary. Where there are differences in elapsed time
                                and duration these would be explained or expanded on in the remark
                                property.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="TimePositionListType">
        <complexContent>
            <extension base="diggs:AbstractTimeObjectType">
                <sequence>
                    <element name="timePositionList" type="diggs:TimeListSimpleType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="TimePositionList" type="diggs:TimePositionListType"
        substitutionGroup="diggs:AbstractTimeObject">
        <annotation>
            <documentation>A DIGGS time object with a property containing a list of time instances
                expressed as xsd:DateTime values.</documentation>
        </annotation>
    </element>
    <element name="TimeIntervalList" type="diggs:TimeIntervalListType"
        substitutionGroup="diggs:AbstractTimeObject">
        <annotation>
            <documentation>A DIGGS time object with a property that contains a list of time
                intervals (duration or elapsed time) expressed as xsd:Decimal values. unit attribute
                provides the time unit for the list</documentation>
        </annotation>
    </element>
    <complexType name="TimeIntervalListType">
        <complexContent>
            <extension base="diggs:AbstractTimeObjectType">
                <sequence>
                    <element ref="diggs:timeIntervalList"/>
                </sequence>
                <attribute name="unit" type="gml:TimeUnitType" use="required"/>
                <attribute name="radix" type="positiveInteger"/>
                <attribute name="factor" type="integer"/>
            </extension>
        </complexContent>
    </complexType>
    <simpleType name="TimeListSimpleType">
        <annotation>
            <documentation>A list of dateTime instances</documentation>
        </annotation>
        <list itemType="gml:TimePositionUnion"/>
    </simpleType>
    <element name="timeIntervalList" type="diggs:TimeIntervalListSimpleType"/>
    <simpleType name="TimeIntervalListSimpleType">
        <annotation>
            <documentation>A list of decimal values representing time intervals (duration or elapsed
                time) instances.</documentation>
        </annotation>
        <list itemType="decimal"/>
    </simpleType>
    <element abstract="false" name="Transect"
        substitutionGroup="diggs:AbstractLinearSamplingFeature" type="diggs:TransectType">
        <annotation>
            <documentation>A generic linear sampling feature that extends along the surface of an
                investigation target; used for such features as geophysical arrays, measured
                sections, etc.</documentation>
        </annotation>
    </element>
    <complexType name="TransectType">
        <complexContent>
            <extension base="diggs:AbstractLinearSamplingFeatureType">
                <sequence>
                    <element maxOccurs="1" minOccurs="0" name="whenTransectRun"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The period of time when during which the transect is
                                run.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="totalTransectLength" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The total length of the transect.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="transectPurpose" type="gml:CodeType">
                        <annotation>
                            <documentation>A description of the purpose for running the transect.
                                Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="TrenchConstructionMethod" type="diggs:TrenchConstructionMethodType">
        <annotation>
            <documentation>An object that contains properties related to the method of construction
                of a trench wall or trial pit sampling feature.</documentation>
        </annotation>
    </element>
    <complexType name="TrenchConstructionMethodPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:TrenchConstructionMethod"/>
        </sequence>
    </complexType>
    <complexType name="TrenchConstructionMethodType">
        <complexContent>
            <extension base="diggs:AbstractNamedRoleObjectType">
                <sequence>
                    <element minOccurs="0" ref="diggs:location">
                        <annotation>
                            <documentation>The location within the sampling feature that corresponds
                                to the particular construction method being referenced here. If
                                omitted, it is assumed that the procedures specified apply to the
                                entire extent of the sampling feature</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="methodTime"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The period of time during which the construction event is
                                occurring</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="trenchStability" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>Uncontrolled string describing stability conditions of
                                the trench during this interval</documentation>
                        </annotation>
                    </element>
                    <element name="constructionMethod" type="diggs:SpecificationPropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <appinfo>diggs:Specification</appinfo>
                            <documentation>A property element that supports a value by reference
                                only. The target value is indicated in the appinfo
                                element.</documentation>
                        </annotation>
                    </element>
                    <element name="constructionEquipment" type="diggs:EquipmentPropertyType"
                        maxOccurs="unbounded" minOccurs="0">
                        <annotation>
                            <appinfo>diggs:AbstractEquipment</appinfo>
                            <documentation>A property element that contains an Equipment feature (or
                                reference to one) that details the construction equipment
                                used.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="TrenchWall" substitutionGroup="diggs:AbstractPlanarSamplingFeature"
        type="diggs:TrenchWallType">
        <annotation>
            <documentation>A wall of a trench or pit dug into the ground and represented by a
                PlanarSurface or MultiPlanar surface geometry.</documentation>
        </annotation>
    </element>
    <element name="TrenchWallEvent" substitutionGroup="diggs:AbstractEvent"
        type="diggs:TrialPitEventType">
        <annotation>
            <documentation>An object containing properties describing a time or location related
                event that occurs during construction of a trial pit or trench wall.</documentation>
        </annotation>
    </element>
    <complexType name="TrenchWallEventPropertyType">
        <sequence>
            <element ref="diggs:TrenchWallEvent"/>
        </sequence>
    </complexType>
    <complexType name="TrenchWallType">
        <complexContent>
            <extension base="diggs:AbstractPlanarSamplingFeatureType">
                <sequence>
                    <element maxOccurs="1" minOccurs="0" name="whenConstructed"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The period of time when the trench is constructed. This
                                should include the entire time the trench is open for
                                logging.</documentation>
                        </annotation>
                    </element>
                    <element name="trenchDepth" type="eml:LengthMeasure" minOccurs="0">
                        <annotation>
                            <documentation>The maximum depth of the trench, referenced to a linear
                                reference system.</documentation>
                        </annotation>
                    </element>
                    <element name="trenchLength" type="eml:LengthMeasure" minOccurs="0"
                        maxOccurs="1">
                        <annotation>
                            <documentation>The length of the long horizontal dimension of the
                                trench. </documentation>
                        </annotation>
                    </element>
                    <element name="trenchWidth" type="eml:LengthMeasure" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>The length of the short horizontal dimension of the
                                trench.</documentation>
                        </annotation>
                    </element>
                    <element name="shoring" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Description of shoring equipment and method used for
                                shoring trench.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="trenchPurpose" type="gml:CodeType">
                        <annotation>
                            <documentation>A description of the purpose for excavating the trench
                                (eg. exploratory). Intended to come from a controlled
                                list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="backfill" type="diggs:BackfillPropertyType">
                        <annotation>
                            <documentation>Information on construction of the trench backfill
                                covering the trench wall exposure.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="constructionMethod"
                        type="diggs:TrenchConstructionMethodPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information regarding construction of the pit over
                                different depth intervals</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="constructionEvent"
                        type="diggs:TrenchWallEventPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on construction of the trench with
                                time</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="TrialPit" substitutionGroup="diggs:AbstractLinearSamplingFeature"
        type="diggs:TrialPitType">
        <annotation>
            <documentation>A relatively shallow excavation into the earth's surface, dug either
                manually or by a mechanical excavator. Samples,observations and tests in the trial
                pit are referenced in a linear referencing system only (1D). This is a legacy
                sampling feature to support AGS trial pit constructs. The TrenchWall sampling
                feature should be used to represent more detail on walls of pits or trenches in
                2D.</documentation>
        </annotation>
    </element>
    <element name="TrialPitEvent" substitutionGroup="diggs:AbstractEvent"
        type="diggs:TrialPitEventType"/>
    <complexType name="TrialPitEventPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:TrialPitEvent"/>
        </sequence>
    </complexType>
    <complexType name="TrialPitEventType">
        <complexContent>
            <extension base="diggs:AbstractEventType">
                <sequence>
                    <element minOccurs="0" name="depth" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>Measured Depth to base of the pit or trench at this event
                                time, reported in the pit's linear referencing
                                system.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="length" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The horizontal length of the long dimension of the pit or
                                trench at this event time.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="width" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The horizontal length of the short dimension of the pit
                                or trench at this event time.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="stability" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>Uncontrolled string describing stability conditions of
                                the pit or trench at this point in time.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="TrialPitType">
        <complexContent>
            <extension base="diggs:AbstractLinearSamplingFeatureType">
                <sequence>
                    <element maxOccurs="1" minOccurs="0" name="whenConstructed"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The period of time when the hole is constructed. This
                                should include the entire time the drill rig is on
                                site.</documentation>
                        </annotation>
                    </element>
                    <element name="totalMeasuredDepth" type="eml:LengthMeasure" minOccurs="0">
                        <annotation>
                            <documentation>The maximum depth of the pit, referenced to a linear
                                reference system.</documentation>
                        </annotation>
                    </element>
                    <element name="pitLength" type="eml:LengthMeasure" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>The length of the long horizontal dimension of the pit.
                            </documentation>
                        </annotation>
                    </element>
                    <element name="pitWidth" type="eml:LengthMeasure" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>The length of the short horizontal dimension of the
                                pit.</documentation>
                        </annotation>
                    </element>
                    <element name="shoring" type="diggs:DiggsStringType" minOccurs="0" maxOccurs="1">
                        <annotation>
                            <documentation>Description of shoring equipment and
                                method.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="trialPitPurpose" type="gml:CodeType">
                        <annotation>
                            <documentation>A description of the purpose for excavating the pit (eg.
                                exploratory). Intended to come from a controlled
                                list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="backfill" type="diggs:BackfillPropertyType">
                        <annotation>
                            <documentation>Information on construction of the trial pit
                                backfill.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="constructionMethod"
                        type="diggs:TrenchConstructionMethodPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information regarding construction of the pit over
                                different depth intervals</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="constructionEvent"
                        type="diggs:TrialPitEventPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on construction of the trial pit with
                                time</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Uncertainty" type="diggs:UncertaintyType"
        substitutionGroup="diggs:AbstractObject" abstract="false">
        <annotation>
            <documentation>An object containing properties describing location
                uncertainties.</documentation>
        </annotation>
    </element>
    <complexType name="UncertaintyPropertyType">
        <sequence>
            <element ref="diggs:Uncertainty" minOccurs="1" maxOccurs="1">
                <annotation>
                    <documentation>The Uncertainty object contains properties to define the
                        uncertainty of a location value or measurement</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <complexType name="UncertaintyType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="0" name="plusUncertaintyValue"
                        type="diggs:DescriptorValueType">
                        <annotation>
                            <documentation>Uncertainty is reported as +/- from the reported value
                                (in the same UOM as the value reported); this property reports the +
                                value.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="minusUncertaintyValue"
                        type="diggs:DescriptorValueType">
                        <annotation>
                            <documentation>Accuracy is reported as +/- from the reported value (in
                                the same UOM as the value reported); this property reports the -
                                value.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="confidenceLevel" type="eml:DimensionlessMeasure">
                        <annotation>
                            <documentation>Reported as a percentage (eg. 95%)</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <!-- Proposed Role typing to constrain rolePerformed other than by codelist. Not yet implemented
  <simpleType name="RoleEnumType">
    <restriction base="string">
      <enumeration value="Client"/>
      <enumeration value="Contractor"/>
      <enumeration value="Driller"/>
      <enumeration value="Drilling Firm"/>
      <enumeration value="Lab Technician"/>
      <enumeration value="Laboratory"/>
      <enumeration value="Logger"/>
      <enumeration value="Logging Firm"/>
      <enumeration value="Project Engineer"/>
      <enumeration value="Project Geologist"/>
      <enumeration value="Project Manager"/>
      <enumeration value="Reviewer"/>
      <enumeration value="Sampling Firm"/>
      <enumeration value="Sampler"/>
      <enumeration value="Senior Engineer"/>
      <enumeration value="Senior Geologist"/>
      <enumeration value="Staff Engineer"/>
      <enumeration value="Staff Geologist"/>
    </restriction>
  </simpleType>
  <simpleType name="RolePerformedType">
    <union memberTypes="diggs:RoleEnumType diggs:OtherNameType"/>
  </simpleType>
  -->
    <!-- AbstractMetaData and its type deprecated 3/2017
  <element name="AbstractMetadata" type="diggs:AbstractMetaDataType" abstract="true"
    substitutionGroup="diggs:AbstractNamedObject"/>
  <complexType name="AbstractMetaDataType">
    <complexContent>
      <extension base="diggs:AbstractNamedObjectType"/>
    </complexContent>
  </complexType>
  -->
    <complexType name="AbundanceMeasureType">
        <simpleContent>
            <extension base="diggs:Val0-100Type">
                <attribute name="uom" type="eml:DimensionlessUom" use="required"/>
                <attribute name="approximator" type="diggs:ApproximatorEnumExtType">
                    <annotation>
                        <documentation>A term that indicates approximation or uncertainty in the reported value of the quantity.</documentation>
                    </annotation>
                </attribute>
                <attribute name="byVolume" type="boolean">
                    <annotation>
                        <documentation>Indicates whether the value percentage is by weight or by volume. By weight is the default if the attribute is not present. True indicates that the percentage is by volume.</documentation>
                    </annotation>
                </attribute>
            </extension>
        </simpleContent>
    </complexType>
    <simpleType name="Val0-100Type">
        <restriction base="double">
            <minInclusive value="0"/>
            <maxInclusive value="100"/>
        </restriction>
    </simpleType>
    <!--2015-12-14 Deprecated. Property descriptions interpreted from measurements should be managed within the measurements property of DIGGS
  <element name="PropertyDescription" substitutionGroup="diggs:AbstractObservation"
    type="diggs:PropertyDescriptionType">
    <annotation>
      <documentation>A property layer system contains layer that are defined by simple text or
        numeric values - usually interpreted as a result of some lab or in-situ test. Observations within
        a property layer system must not overlap and the value of the gml:name of each property
        layer must be the same among all layers in the system </documentation>
    </annotation>
  </element>
  <complexType name="PropertyDescriptionType">
    <complexContent mixed="false">
      <extension base="diggs:AbstractObservationType">
        <sequence minOccurs="0">
          <element name="property" type="diggs:PropertyPropertyType"/>
          <element name="value" type="diggs:DiggsStringType"/>
        </sequence>
      </extension>
    </complexContent>
  </complexType>
  -->
    <element name="VectorLinearSpatialReferenceSystem"
        type="diggs:VectorLinearSpatialReferenceSystemType"
        substitutionGroup="diggs:AbstractRelativeReferenceSystem">
        <annotation>
            <documentation>An object extending glr:LinearSRS to add an offset vector to fix a planar
                orientation, this fixing a planar relative spatial reference system </documentation>
        </annotation>
    </element>
    <complexType name="VectorLinearSpatialReferenceSystemPropertyType">
        <sequence>
            <element ref="diggs:VectorLinearSpatialReferenceSystem"/>
        </sequence>
    </complexType>
    <complexType name="VectorLinearSpatialReferenceSystemType">
        <complexContent>
            <extension base="diggs:AbstractRelativeReferenceSystemType">
                <sequence>
                    <element name="offsetVector" type="glrov:VectorType" maxOccurs="3" minOccurs="1">
                        <annotation>
                            <documentation>A unit vector that defines the orientation of the planar
                                surface extending from the planar surface's reference edge</documentation>
                        </annotation>
                    </element>
                    <!-- glrov:VectorType add uom attribute to gml:VectorType -->
                    <element minOccurs="0" name="linearReferencingMethodUncertainty"
                        type="diggs:UncertaintyPropertyType">
                        <annotation>
                            <documentation>Provides accuracy value (usually a length measure) for
                                the location (geometry) elements that use this linear reference
                                system for their SRS. For example, for depths in a hole, this
                                property could provide information as to the source and accuracy of
                                depth values that relate to this reference system. If individual
                                elements that refer to this reference system have different
                                uncertainties, those uncertainties are reported within those
                                elements themselves.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="vectorOffsetUncertainty"
                        type="diggs:LocationUncertaintyPropertyType">
                        <annotation>
                            <documentation>Provides accuracy value for the offset
                                vector</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <!-- replace this definition that depends on an invalid profile of glrov:VectorOffsetLinearSRSType
  <complexType name="VectorLinearSpatialReferenceSystemType">
    <complexContent>
      <extension base="glrov:VectorOffsetLinearSRSType">
        <sequence>
          <element minOccurs="0" name="linearElementAccuracy"
            type="diggs:LocationAccuracyPropertyType">
            <annotation>
              <documentation>Provides accuracy information for the linear element referenced by this
                reference system.</documentation>
            </annotation>
          </element>
          <element minOccurs="0" name="linearReferencingMethodAccuracy"
            type="diggs:LocationAccuracyPropertyType">
            <annotation>
              <documentation>Provides accuracy information for the location (geometry) elements that
                use this linear reference system for their SRS. For example, for depths in a hole,
                this property could provide information as to the source and accuracy of depth
                values that relate to this reference system.</documentation>
            </annotation>
          </element>
        </sequence>
      </extension>
    </complexContent>
  </complexType>
  with the following one to get the same XML instance document content model 
  except for the glrov: namespace prefix on the offsetVector element. -->
    <simpleType name="WaterContentMethodEnumType">
        <restriction base="string">
            <enumeration value="full specimen"/>
            <enumeration value="trimmings"/>
            <enumeration value="unknown"/>
        </restriction>
    </simpleType>
    <simpleType name="WaterContentMethodType">
        <annotation>
            <documentation>A value that describes the specific approach by which the water content
                is determined, eg. whether from specimen trimmings or full specimen</documentation>
        </annotation>
        <union memberTypes="diggs:WaterContentMethodEnumType diggs:OtherNameType"/>
    </simpleType>
    <complexType name="WaterContentMeasureType">
        <simpleContent>
            <extension base="eml:VolumePerVolumeMeasure">
                <attribute name="derivedFrom" type="diggs:WaterContentMethodType"/>
            </extension>
        </simpleContent>
    </complexType>
    <element name="WaterStrike" substitutionGroup="diggs:AbstractObject"
        type="diggs:WaterStrikeType">
        <annotation>
            <documentation>A water strike consists of one or more water level readings taken upon encountering or expecting to encounter water during drilling. Depending on practice, this may consist of individual reasurements taken one or more times as drilling progresses or a series of measurements taken over a short time interval when drilling is halted at a particular depth.</documentation>
        </annotation>
    </element>
    <complexType name="WaterStrikePropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:WaterStrike"/>
        </sequence>
    </complexType>
    <element name="WaterStrikeReading" substitutionGroup="diggs:AbstractObject"
        type="diggs:WaterStrikeReadingType">
        <annotation>
            <documentation>An element containing water level reading properties following a water
                strick.</documentation>
        </annotation>
    </element>
    <element name="LinkedWSReading" substitutionGroup="diggs:AbstractObject"
        type="diggs:LinkedWSReadingType">
        <annotation>
            <documentation>An element containing water level reading properties following a water
                strick.</documentation>
        </annotation>
    </element>
    <complexType name="WaterStrikeReadingPropertyType">
        <sequence maxOccurs="1" minOccurs="1">
            <element ref="diggs:WaterStrikeReading"/>
        </sequence>
    </complexType>
    <complexType name="LinkedWSReadingPropertyType">
        <sequence maxOccurs="1" minOccurs="1">
            <element ref="diggs:LinkedWSReading"/>
        </sequence>
    </complexType>
    <complexType name="WaterStrikeReadingType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <choice minOccurs="0">
                        <element name="elapsedTime" type="eml:TimeMeasure">
                            <annotation>
                                <documentation><![CDATA[The elapsed time following an initial water strike when water level is again measured]]></documentation>
                            </annotation>
                        </element>
                        <element name="dateTime" type="gml:TimePositionType" minOccurs="1">
                            <annotation>
                                <documentation><![CDATA[DateTime that water strike measurement occurred.]]></documentation>
                            </annotation>
                        </element>
                    </choice>
                    <choice>
                        <element name="notEncountered" fixed="true" type="boolean" minOccurs="1"> </element>
                        <element name="waterLocation" type="diggs:PointLocationPropertyType">
                            <annotation>
                                <documentation>The measure depth to water; measured in a hole's linear
                                referencing system.</documentation>
                            </annotation>
                        </element>
                    </choice>
                    <element maxOccurs="unbounded" minOccurs="0" name="linkedReading"
                        type="diggs:LinkedWSReadingPropertyType"/>
                </sequence>

            </extension>
        </complexContent>
    </complexType>
    <complexType name="LinkedWSReadingType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <choice minOccurs="0">
                        <element name="elapsedTime" type="eml:TimeMeasure">
                            <annotation>
                                <documentation><![CDATA[The elapsed time following an initial water strike when water level is again measured]]></documentation>
                            </annotation>
                        </element>
                        <element name="dateTime" type="gml:TimePositionType" minOccurs="1">
                            <annotation>
                                <documentation><![CDATA[DateTime that water strike measurement occurred.]]></documentation>
                            </annotation>
                        </element>
                    </choice>
                    <choice>
                        <element name="notEncountered" fixed="true" type="boolean" minOccurs="1"> </element>
                        <element name="waterLocation" type="diggs:PointLocationPropertyType">
                            <annotation>
                                <documentation>The measure depth to water; measured in a hole's linear
                                referencing system.</documentation>
                            </annotation>
                        </element>
                    </choice>
                </sequence>

            </extension>
        </complexContent>
    </complexType>
    <complexType name="WaterStrikeType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence minOccurs="0">
                    <element name="waterStrikeReadings" type="diggs:WaterStrikeReadingPropertyType">
                        <annotation>
                            <documentation>Water level readings taken as part of this water strike.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="sealLocation"
                        type="diggs:PointLocationPropertyType">
                        <annotation>
                            <documentation>Location at which water strike is sealed by
                                        casing; measured in borehole linear referencing
                                        system.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="bottomCasing"
                        type="diggs:PointLocationPropertyType">
                        <annotation>
                            <documentation>Measured depth to base of casing at time water strike
                                occurred; measured in borehole linear referencing
                                system.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="bottomHole" type="diggs:PointLocationPropertyType">
                        <annotation>
                            <documentation>Location of the bottom of the hole when the water strike readings are made, given in the hole's linear referencing system.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>

    <!-- Deprecate these custom types and only allow xsd:boolean type instead of more liberal use of terms for t/f DJP 12-15-2015
  <simpleType name="BooleanEnumType">
    <union memberTypes="boolean diggs:DiggsBooleanEnumType"/>
  </simpleType>
  <simpleType name="DiggsBooleanEnumType">
    <restriction base="string">
      <enumeration value="True"/>
      <enumeration value="False"/>
      <enumeration value="Yes"/>
      <enumeration value="No"/>
      <enumeration value="yes"/>
      <enumeration value="no"/>
    </restriction>
  </simpleType>
  -->
    <element abstract="false" name="Well" substitutionGroup="diggs:AbstractLinearSamplingFeature"
        type="diggs:WellType">
        <annotation>
            <documentation>A sampling feature that is an installation within a borehole or sounding,
                used for observing, withdrawing, or injecting fluids. Although wells are discrete
                sampling features in their own right, they are installed within boreholes or
                soundings, and must reference the parent borehole or sounding feature within the
                mandatory samplingFeatureRef property.</documentation>
        </annotation>
    </element>
    <element name="WellOpening" type="diggs:WellOpeningType">
        <annotation>
            <documentation>An object containing properties that define the location and
                characteristics of a well screen or perforations within a Well sampling
                feature.</documentation>
        </annotation>
    </element>
    <complexType name="WellOpeningPropertyType">
        <sequence>
            <element maxOccurs="1" minOccurs="1" ref="diggs:WellOpening"/>
        </sequence>
    </complexType>
    <complexType name="WellOpeningType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element minOccurs="1" name="openInterval" type="diggs:LinearExtentPropertyType">
                        <annotation>
                            <documentation>The depth interval in which the well openings occur.
                                Recorded in a linear reference system for the well.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" ref="diggs:filterPackInterval">
                        <annotation>
                            <documentation>The depth interval in which the filter pack surrounding
                                the well screen or well openings occur. DEPRECATED. Filter pack
                                information should be entered as a Backfill object with a reference
                                there to this well opening object.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="openingLength" type="eml:LengthMeasure"/>
                    <element minOccurs="0" name="openingWidth" type="eml:LengthMeasure"/>
                    <element minOccurs="0" name="openingDiameter" type="eml:LengthMeasure"/>
                    <element minOccurs="0" name="openingType" type="gml:CodeType">
                        <annotation>
                            <documentation>The type of well screen or perforation (eg. wire-wound
                                screen, louvered or shuttered, perforated casing,
                                etc.)</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="openingMaterial" type="gml:CodeType">
                        <annotation>
                            <documentation>The type of material that the well screen or perforation
                                interval is composed of.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="WellType">
        <complexContent>
            <extension base="diggs:AbstractLinearInstallationType">
                <sequence>
                    <element minOccurs="0" name="aquiferTested" type="gml:CodeType">
                        <annotation>
                            <documentation>Name or other identifier for the aquifer being sampled by
                                the well.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="fluidPurpose" type="gml:CodeType">
                        <annotation>
                            <documentation>If a production or extraction well, a code or description
                                of the purpose for the fluid (eg. public supply, municipal,
                                etc.)</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="initialDevelopmentMethod"
                        type="diggs:SpecificationPropertyType">
                        <annotation>
                            <documentation>Description of the method used to develop the well after
                                initial construction (eg. compressed air, surged,
                                etc.)</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="initialDevelopmentTime"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>Time required for initial development </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="maintenanceEvent"
                        type="diggs:InstallationEventPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on the occurrence and activities involved in
                                well maintenance and servicing.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="opening" type="diggs:WellOpeningPropertyType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on the location and type of well openings
                                (perforations) installed to allow fluid communication between the
                                well and adjacent earth material</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" ref="diggs:sanitarySealLocation"/>

                    <element minOccurs="0" ref="diggs:sanitarySealType">
                        <annotation>
                            <documentation/>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="specialTreatment" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>Description of any special procedures employed upon
                                initial development of well.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="wellAbandonment"
                        type="diggs:InstallationEventPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on the occurrence and procedures performed
                                upon abandoning the well</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="wellCasing" type="diggs:CasingPropertyType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Information on the type and location of the solid well
                                casing installed.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="wellDepth" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The measured depth to the bottom of the well, measured from the top of the well casing or the well's centerline origin if different from top of casing</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="wellFinishType" type="gml:CodeType">
                        <annotation>
                            <documentation>Description of how the well is finished (eg. gravel pack
                                with perforations, open end, sand point, etc.) </documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="wellPurpose" type="gml:CodeType">
                        <annotation>
                            <documentation>A description of the purpose for installing the hole (eg.
                                ground water withdrawal, observation, etc.). Intended to come from a
                                controlled list.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="DiggsType">
        <complexContent>
            <extension base="gml:AbstractFeatureType">
                <sequence>
                    <element name="documentInformation" type="diggs:DocumentInformationPropertyType"
                        minOccurs="1" maxOccurs="1"/>
                    <element name="project" type="diggs:ProjectPropertyType" minOccurs="0"
                        maxOccurs="unbounded"/>
                    <element minOccurs="0" name="program" type="diggs:AbstractProgramPropertyType"
                        maxOccurs="unbounded"/>
                    <element minOccurs="0" name="samplingFeature"
                        type="diggs:AbstractSamplingFeaturePropertyType" maxOccurs="unbounded"/>
                    <element minOccurs="0" name="samplingActivity"
                        type="diggs:SamplingActivityPropertyType" maxOccurs="unbounded"/>
                    <element name="sample" type="diggs:AbstractSamplePropertyType" minOccurs="0"
                        maxOccurs="unbounded"/>
                    <element minOccurs="0" name="observation"
                        type="diggs:ObservationSystemPropertyType" maxOccurs="unbounded"/>
                    <element minOccurs="0" name="measurement"
                        type="diggs:AbstractMeasurementPropertyType" maxOccurs="unbounded"/>
                    <element minOccurs="0" name="constructionActivity"
                        type="diggs:AbstractConstructionActivityPropertyType" maxOccurs="unbounded"/>
                    <element name="group" type="diggs:GroupPropertyType" minOccurs="0"
                        maxOccurs="unbounded"/>
                </sequence>
                <attribute ref="xml:lang"/>
            </extension>
        </complexContent>
    </complexType>
    <element name="programRef" type="diggs:FeatureReferenceType">
        <annotation>
            <documentation>A reference to a program that is associated with this feature.
            </documentation>
        </annotation>
    </element>
    <element name="programSpecificationRef" type="diggs:FeatureReferenceType">
        <annotation>
            <documentation>A reference to a specification or design object within the associated
                program feature that is relevant for this activity</documentation>
        </annotation>
    </element>
    <element abstract="true" name="AbstractProcedure" substitutionGroup="diggs:AbstractFeature"
        type="diggs:AbstractProcedureType"/>
    <complexType abstract="true" name="AbstractProcedureType">
        <complexContent>
            <extension base="diggs:AbstractFeatureType">
                <sequence/>
            </extension>
        </complexContent>
    </complexType>
    <element name="timeInterval" type="diggs:TimeIntervalPropertyType">
        <annotation>
            <documentation>A property with property type containing a time interval object that
                recordes the time at the beginning and end of the trial or test increment, and/or
                duration</documentation>
        </annotation>
    </element>
    <element name="baseBoundary" type="diggs:BoundaryPropertyType">
        <annotation>
            <documentation>Description of the boundary at the base of the observed zone or interval
                as defined in the observation's location property</documentation>
        </annotation>
    </element>
    <complexType name="LengthPerTimeMeasureType">
        <simpleContent>
            <extension base="eml:AbstractMeasure">
                <attribute name="uom" type="diggs:lengthPerTimeUom" use="required"/>
            </extension>
        </simpleContent>
    </complexType>
    <simpleType name="lengthPerTimeUom">
        <union memberTypes="eml:LengthPerTimeUomExt diggs:geotechnicalLengthPerTimeUom"/>
    </simpleType>
    <simpleType name="geotechnicalLengthPerTimeUom">
        <annotation>
            <documentation>Extension to eml unit types for length per time measure 1) cm/h -
                centimetre per hour 2) cm/min - centimetre per minute 3) cm/d - centimetre per day
                4) mm/h - millimetre per hour 5) mm/min - millimetre per minute 6) mm/d - millimetre
                per day </documentation>
        </annotation>
        <restriction base="string">
            <enumeration value="cm/h"/>
            <enumeration value="cm/min"/>
            <enumeration value="cm/d"/>
            <enumeration value="mm/h"/>
            <enumeration value="mm/min"/>
            <enumeration value="mm/d"/>
        </restriction>
    </simpleType>
    <simpleType name="StratUnitEnumType">
        <annotation>
            <documentation>Definitions of the following unit types: 1) allostratigraphic - a body of
                sedimentary rock that is defined and identified only by its bounding discontinuities
                2) biostratigraphic - bodies of rock strata that are defined or characterized on the
                basis of their contained fossils. 3) chemostratigraphic - a body of rock defined on
                the chemical composition of the sediments, rocks, and rock components. 4)
                chronostratigraphic - bodies of rocks, layered or unlayered, that are defined
                between specified stratigraphic horizons which represent specified intervals of
                geologic time. 5) geophysical - bodies of rocks and soils that are distinguished by
                their geophysical properties. The criteria for distinguishing such units may vary
                depending on the engineering application. 6) hydrostratigraphic - a part of a body
                of rock that forms a distinct hydrologic unit with respect to the flow of ground
                water, generally characterized by its porosity and permeability. 7) lithodemic - a
                three-dimensional body composed of one or more intrusive, highly deformed or highly
                metamorphosed rock types, distinguished and delimited on the basis of rock
                characteristics. Its contacts with other rock units may be sedimentary, extrusive,
                intrusive, and tectonic or relate to metamorphic grade. 8) lithostratigraphy -
                bodies of rocks, bedded or unbedded, that are defined and characterized on the basis
                of their lithologic properties and their stratigraphic relations. 9)
                magnetostratigraphic - rock strata unified by similar magnetic characteristics (not
                only magnetic polarity) which allows it to be differentiated from adjacent strata.
                10) pedostratigraphic - units defined based on the stratigraphical and spatial
                relationships and implications of surface and buried soils. It has emerged as a key
                means of interpreting palaeosols; records of metastability in landscapes when rates
                of erosion and accumulation are slow. 11) polarity chronostratigraphic - units
                defined by primary magnetic-polarity record imposed when the rock was deposited or
                crystallized during a specific interval of geologic time. 12) tectonostratigraphic -
                a body characterized by a consistent tectonostratigraphy and metamorphic evolution,
                and bounded by tectonic discontinuities.</documentation>
        </annotation>
        <restriction base="string">
            <enumeration value="allostratigraphic"/>
            <enumeration value="biostratigraphic"/>
            <enumeration value="chemostraitgraphic"/>
            <enumeration value="chronostratigraphic"/>
            <enumeration value="geophysical"/>
            <enumeration value="hydrostraptigraphic"/>
            <enumeration value="lithodemic"/>
            <enumeration value="lithostratigraphic"/>
            <enumeration value="magnetostratigraphic"/>
            <enumeration value="pedostratigraphic"/>
            <enumeration value="polarity chronostratigraphic"/>
            <enumeration value="tectonostratigraphic"/>
        </restriction>
    </simpleType>

    <simpleType name="StratUnitExtEnumType">
        <union memberTypes="diggs:StratUnitEnumType diggs:OtherNameType"/>
    </simpleType>
    <complexType name="SizeClassCodeType">
        <simpleContent>
            <extension base="gml:CodeType">
                <attribute name="sizeClass" type="diggs:SizeClassEnumExtType"/>
            </extension>
        </simpleContent>
    </complexType>
    <simpleType name="SizeClassEnumType">
        <annotation>
            <documentation>Definition of size classes: Grain size classification system should be
                identified in the codeSpace attribute, example size ranges for the size classes are:
                sand - for ASTM, particles between 0,075 and 4.75 mm; for Wentworth, particles
                between 0.0625 and 2 mm. gravel - for ASTM, particles between 4.75 and 75 mm; for
                Wentworth, particles above 2 mm granule - for Wentworth, particles between 2 and 4
                mm pebble - for Wentworth, particles between 4 and 64 mm cobble - for ASTM,
                particles between 75 and 300 mm; for Wentworth, particles between 64 and 256 mm
                boulder - for ASTM, particles above 300 mm; for boulder, particles above 256
                mm</documentation>
        </annotation>
        <restriction base="string">
            <enumeration value="xlay"/>
            <enumeration value="silt"/>
            <enumeration value="sand"/>
            <enumeration value="gravel"/>
            <enumeration value="granule"/>
            <enumeration value="pebble"/>
            <enumeration value="cobble"/>
            <enumeration value="boulder"/>
        </restriction>
    </simpleType>
    <simpleType name="SizeClassEnumExtType">
        <union memberTypes="diggs:SizeClassEnumType diggs:OtherNameType"/>
    </simpleType>
    <complexType name="PlungeMeasureType">
        <simpleContent>
            <restriction base="eml:PlaneAngleMeasure">
                <minInclusive value="-90"/>
                <maxInclusive value="90"/>
            </restriction>
        </simpleContent>
    </complexType>
    <complexType name="BearingMeasureBaseType">
        <simpleContent>
            <restriction base="eml:PlaneAngleMeasure">
                <minInclusive value="0"/>
                <maxInclusive value="360"/>
            </restriction>
        </simpleContent>
    </complexType>
    <element name="status" type="gml:CodeType">
        <annotation>
            <documentation>A text string to provide information about the status of the data
                associated with this object, for example to be used to track QA/QC controls, review
                or release status, etc. The values used are intended to come from a controlled list
                of terms maintained by an authority desingated by this element's codeSpace
                attribute.</documentation>
        </annotation>
    </element>
    <element name="implementationStatus" type="gml:CodeType">
        <annotation>
            <documentation>A text string describing the implementation or completion status of an object or activity. Terms used (such as" in progress", "completed" etc.) are intended to come from a controlled list of terms from a dictionary, or from an authority identified in the codeSpace attribute.</documentation>
        </annotation>
    </element>
    <complexType name="MeasurementWhileDrillingType">
        <complexContent>
            <extension base="diggs:AbstractMeasurementType">
                <sequence>
                    <element name="outcome" type="diggs:MWDResultPropertyType"/>
                    <element minOccurs="0" name="procedure" type="diggs:MWDProcedurePropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="MeasurementWhileDrilling" substitutionGroup="diggs:AbstractMeasurement"
        type="diggs:MeasurementWhileDrillingType"/>
    <element name="MWDResult" type="diggs:MWDResultType"/>
    <complexType name="MWDResultType">
        <complexContent>
            <restriction base="gml:AbstractCoverageType">
                <sequence>
                    <choice>
                        <element ref="diggs:location"/>
                        <element ref="diggs:timeDomain"/>
                    </choice>
                    <element ref="diggs:results"/>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <complexType name="MWDResultPropertyType">
        <sequence>
            <element ref="diggs:MWDResult"/>
        </sequence>
    </complexType>
    <element name="DrillRig" substitutionGroup="diggs:AbstractEquipment" type="diggs:DrillRigType"/>
    <complexType name="DrillRigType">
        <complexContent>
            <extension base="diggs:AbstractEquipmentType">
                <sequence>
                    <element minOccurs="0" name="engine" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>A text string describing the name and other parameters
                                associated with the engine that drives the drill rig.
                            </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="carrierType" type="gml:CodeType">
                        <annotation>
                            <documentation>A description of the type of device that "carries" the
                                rig, eg. "rubber tire ATV", "truck mounted", "track mounted".
                                Intended to come from a controled list of terms. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="tireSizeFront" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>A text string describing the size of the front tires for
                                a rubber tire mounted rig.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="tireSizeRear" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>A text string describing the size of the rear tires for a
                                rubber tire mounted rig.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="groundBearingPressure"
                        type="eml:PressureMeasureExt">
                        <annotation>
                            <documentation>The typical or maximum pressure exerted on the ground by
                                the weight of the rig.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="numberForwardGears" type="positiveInteger">
                        <annotation>
                            <documentation>The number of forward gears in the
                                transmission.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="numberReverseGears" type="positiveInteger">
                        <annotation>
                            <documentation>The number of reverse gears in the
                                transmission.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="transferCaseInfo" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>A text string describing the transfer case capabilities,
                                eg. "air shift controls for drill, rear axle (4x2) and front axle
                                (4x4)"</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="axleInfo" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>A text string describing axle information where
                                applicable, eg. "planetary with no-spin differentials, front and
                                rear"</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="winchCapacity"
                        type="diggs:WinchCapacityMeasureType">
                        <annotation>
                            <documentation>Maximum capacity of the winch (expressed as a
                                weight).</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="waterTankCapacity" type="eml:VolumeMeasureExt">
                        <annotation>
                            <documentation>Maximum volume of the onboard water tank.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="levelingSystem" type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>A text string describing the system used for leveling the
                                rig (eg."Three hydraulic jacks, 36 inch (91.4 cm) stroke"
                            </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rotaryDriveMaxTorque"
                        type="eml:MomentOfForceMeasureExt">
                        <annotation>
                            <documentation>The maximum torque produced by the rotary drive system.
                            </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rotaryDriveMaxSpeed"
                        type="eml:AngularVelocityMeasureExt">
                        <annotation>
                            <documentation>The maximum rotational speed of the rotary drive system.
                            </documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="rotaryDriveGearRatio"
                        type="diggs:rotaryDriveGearRatioMeasureType">
                        <annotation>
                            <documentation>The ratio between the input rotation speed at the head
                                and rotation of the bit, depending on the gear
                                selected.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="pullDownForceMax" type="eml:ForceMeasureExt">
                        <annotation>
                            <documentation>Maximum crowd or pulldown force of the feed
                                system.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="feedRateMax" type="eml:LengthPerTimeMeasureExt">
                        <annotation>
                            <documentation>Maximum rate that the rig can feed the drill pipe into
                                the ground</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="retractForceMax" type="eml:ForceMeasureExt">
                        <annotation>
                            <documentation>Maximum retract force of the feed system.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="retractRateMax" type="eml:LengthPerTimeMeasureExt">
                        <annotation>
                            <documentation>Maximum rate that the rig can retract the drill
                                pipe</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="strokeMax" type="eml:LengthMeasureExt">
                        <annotation>
                            <documentation>Maximum stroke height of the feed system.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="crowdSystemType" type="gml:CodeType">
                        <annotation>
                            <documentation>The type of system used to apply downward pressure
                                (typically winch or cylinder). Intended to come from a controlled
                                list of terms.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="crowdCylinderArea" type="eml:AreaMeasureExt">
                        <annotation>
                            <documentation>For a cylinder crowd system, this property holds the
                                cross-sectional area of the crowd sylinder.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="baselineCroudPressure"
                        type="eml:PressureMeasureExt">
                        <annotation>
                            <documentation>The standard operating pressure for crowd force
                                application on the drill rig,</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="crowdConversionCoeff" type="double">
                        <annotation>
                            <documentation>The ratio of crowd force to the pressure applied
                                (force/pressure) to convert crowd pressure to force.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="baselineTorquePressure"
                        type="eml:PressureMeasureExt">
                        <annotation>
                            <documentation>The standard operating pressure for torque application on
                                the drill rig,</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="noHydraulicMotors" type="integer">
                        <annotation>
                            <documentation>The count of hydraulic motors used in the drilling
                                setup.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="maxHydMotorDisplacement"
                        type="eml:VolumePerRotationMeasureExt">
                        <annotation>
                            <documentation>he maximum volume displaced by the hydraulic motor per
                                revolution.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="minHydMotorDisplacement"
                        type="eml:VolumePerRotationMeasureExt">
                        <annotation>
                            <documentation>The minimum volume displaced by the hydraulic motor per
                                revolution.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="maxHydPressure" type="eml:PressureMeasureExt">
                        <annotation>
                            <documentation>The highest pressure at which the drill rig's hydraulic
                                system can operate.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="maxTorque" type="eml:MomentOfForceMeasureExt">
                        <annotation>
                            <documentation>The highest rotational force that can be applied by the
                                drill rig</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="mastLength" type="eml:LengthMeasureExt">
                        <annotation>
                            <documentation>Nominal length of the mast, typically measured from
                                ground to sheaves.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>

    <complexType name="rotaryDriveGearRatioMeasureType">
        <simpleContent>
            <extension base="double">
                <attribute name="gearNumber" type="positiveInteger" use="required">
                    <annotation>
                        <documentation>The gear number associated with this ratio (eg. 1, 2 or 3
                            etc.</documentation>
                    </annotation>
                </attribute>
            </extension>
        </simpleContent>
    </complexType>

    <complexType name="WinchCapacityMeasureType">
        <simpleContent>
            <extension base="eml:ForceMeasureExt">
                <attribute name="winchLocation" type="string">
                    <annotation>
                        <documentation>Location of the winch on the rig (eg. front,
                            rear)</documentation>
                    </annotation>
                </attribute>
            </extension>
        </simpleContent>
    </complexType>

    <complexType name="DrillPipeType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectType">
                <sequence>
                    <element minOccurs="0" name="pipeInnerDiameter" type="eml:LengthMeasureExt">
                        <annotation>
                            <documentation>The inner diameter of the drill pipe (where hollow pipe
                                is used).</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="pipeOuterDiameter" type="eml:LengthMeasureExt">
                        <annotation>
                            <documentation>The outer diameter of the drill pipe.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="pipeMaterial" type="gml:CodeType">
                        <annotation>
                            <documentation>The material that the pipe is made from, eg. steel.
                                Intended to come from a controlled list of terms.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="pipeSectionLength" type="eml:LengthMeasureExt">
                        <annotation>
                            <documentation>The length of each pipe section used for this depth
                                interval. Note: if pipe section lengths change, a new new DrillPipe
                                object should be instantiated to identify the depth interval for the
                                new pipe section length.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="pipeSectcionWeight" type="eml:ForceMeasureExt">
                        <annotation>
                            <documentation>Weight of an individual pipe section used in this
                                interval.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="DrillPipeArrayPropertyType">
        <sequence maxOccurs="1">
            <element ref="diggs:DrillPipe"/>
        </sequence>
    </complexType>
    <element name="DrillPipe" substitutionGroup="diggs:AbstractComponentObject"
        type="diggs:DrillPipeType"/>
    <complexType name="CuttingToolType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectType">
                <sequence>
                    <element minOccurs="0" name="toolType" type="gml:CodeType">
                        <annotation>
                            <documentation>The type of cutting tool (bit) used, such as hollow-stem
                                auger, tri-cone bit, roller bit, etc. Intended to come form a
                                controlled list of terms.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="toolInnerDiameter" type="eml:LengthMeasureExt">
                        <annotation>
                            <documentation>The inner diameter of the cuktting tool or bit (where
                                applicable, such as for a hollow stem auger).</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="toolOuterDiameter" type="eml:LengthMeasureExt">
                        <annotation>
                            <documentation>The outer diameter of the cutting tool or
                                bit.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="toolMaterial" type="gml:CodeType">
                        <annotation>
                            <documentation>The material that the tool is made from, eg. tungsten
                                carbide. Intended to come from a controlled list of
                                terms.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="CuttingToolArrayPropertyType">
        <sequence maxOccurs="1">
            <element ref="diggs:CuttingTool"/>
        </sequence>
    </complexType>
    <element name="CuttingTool" substitutionGroup="diggs:AbstractComponentObject"
        type="diggs:CuttingToolType"/>
    <simpleType name="mimeTypeEnumType">
        <annotation>
            <documentation>Enumerated list of common MIME types</documentation>
        </annotation>
        <restriction base="string">
            <!-- Application types -->

            <!-- Text types -->

            <!-- Image types -->

            <!-- Video types -->
            <enumeration value="application/javascript"/>
            <enumeration value="application/json">
                <annotation>
                    <documentation>JavaScript Object Notation data format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/pdf">
                <annotation>
                    <documentation>Adobe Portable Document Format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/xml">
                <annotation>
                    <documentation>Extensible Markup Language document</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/zip">
                <annotation>
                    <documentation>ZIP archive format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/x-www-form-urlencoded">
                <annotation>
                    <documentation>Form encoded data from HTML forms</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/vnd.ms-excel">
                <annotation>
                    <documentation>Microsoft Excel spreadsheet (legacy .xls format)</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet">
                <annotation>
                    <documentation>Microsoft Excel spreadsheet (.xlsx format)</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/msword">
                <annotation>
                    <documentation>Microsoft Word document (legacy .doc format)</documentation>
                </annotation>
            </enumeration>
            <enumeration
                value="application/vnd.openxmlformats-officedocument.wordprocessingml.document">
                <annotation>
                    <documentation>Microsoft Word document (.docx format)</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/javascript">
                <annotation>
                    <documentation>JavaScript code (application type)</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/octet-stream">
                <annotation>
                    <documentation>Binary data with no specific type</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/x-tar">
                <annotation>
                    <documentation>TAR archive format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/graphql">
                <annotation>
                    <documentation>GraphQL query language content</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/x-httpd-php">
                <annotation>
                    <documentation>PHP script file</documentation>
                </annotation>
            </enumeration>
            <enumeration value="application/rtf">
                <annotation>
                    <documentation>Rich Text Format document</documentation>
                </annotation>
            </enumeration>
            <enumeration value="text/plain">
                <annotation>
                    <documentation>Plain text without formatting</documentation>
                </annotation>
            </enumeration>
            <enumeration value="text/html">
                <annotation>
                    <documentation>HyperText Markup Language document</documentation>
                </annotation>
            </enumeration>
            <enumeration value="text/css">
                <annotation>
                    <documentation>Cascading Style Sheets</documentation>
                </annotation>
            </enumeration>
            <enumeration value="text/javascript">
                <annotation>
                    <documentation>JavaScript code (text type)</documentation>
                </annotation>
            </enumeration>
            <enumeration value="text/csv">
                <annotation>
                    <documentation>Comma-Separated Values data</documentation>
                </annotation>
            </enumeration>
            <enumeration value="text/xml">
                <annotation>
                    <documentation>XML document (text type)</documentation>
                </annotation>
            </enumeration>
            <enumeration value="text/markdown">
                <annotation>
                    <documentation>Markdown formatted text</documentation>
                </annotation>
            </enumeration>
            <enumeration value="text/rtf">
                <annotation>
                    <documentation>Rich Text Format (text type)</documentation>
                </annotation>
            </enumeration>
            <enumeration value="text/calendar">
                <annotation>
                    <documentation>iCalendar data format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="text/cache-manifest">
                <annotation>
                    <documentation>Application cache manifest</documentation>
                </annotation>
            </enumeration>
            <enumeration value="image/jpeg">
                <annotation>
                    <documentation>JPEG image format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="image/png">
                <annotation>
                    <documentation>Portable Network Graphics format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="image/gif">
                <annotation>
                    <documentation>Graphics Interchange Format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="image/svg+xml">
                <annotation>
                    <documentation>Scalable Vector Graphics format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="image/webp">
                <annotation>
                    <documentation>WebP image format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="image/avif">
                <annotation>
                    <documentation>AV1 Image File Format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="image/tiff">
                <annotation>
                    <documentation>Tagged Image File Format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="image/bmp">
                <annotation>
                    <documentation>Bitmap image format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="image/x-icon">
                <annotation>
                    <documentation>Icon format (ICO)</documentation>
                </annotation>
            </enumeration>
            <enumeration value="image/vnd.microsoft.icon">
                <annotation>
                    <documentation>Microsoft Icon format (ICO)</documentation>
                </annotation>
            </enumeration>
            <enumeration value="video/mp4">
                <annotation>
                    <documentation>MPEG-4 video format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="video/webm">
                <annotation>
                    <documentation>WebM video format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="video/ogg">
                <annotation>
                    <documentation>Ogg video format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="video/x-msvideo">
                <annotation>
                    <documentation>AVI video format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="video/quicktime">
                <annotation>
                    <documentation>QuickTime video format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="video/mpeg">
                <annotation>
                    <documentation>MPEG video format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="video/3gpp">
                <annotation>
                    <documentation>3GPP video format for mobile devices</documentation>
                </annotation>
            </enumeration>
            <enumeration value="video/x-ms-wmv">
                <annotation>
                    <documentation>Windows Media Video format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="video/x-flv">
                <annotation>
                    <documentation>Flash Video format</documentation>
                </annotation>
            </enumeration>
            <enumeration value="video/H264">
                <annotation>
                    <documentation>H.264 video format</documentation>
                </annotation>
            </enumeration>
        </restriction>
    </simpleType>
    <simpleType name="mimeTypeEnumExtType">
        <union memberTypes="diggs:otherMimeTypeType diggs:mimeTypeEnumType"/>
    </simpleType>
    <simpleType name="otherMimeTypeType">
        <annotation>
            <documentation>Pattern for custom MIME types starting with "Other:" followed by type/subtype format</documentation>
        </annotation>
        <restriction base="string">
            <pattern value="Other: [a-z\-\+\.]+/[a-z0-9\-\+\.]+">
                <annotation>
                    <documentation>
                        Pattern matches "Other: " followed by:
                        - type: lowercase letters, hyphens, plus signs, dots
                        - forward slash
                        - subtype: lowercase letters, numbers, hyphens, plus signs, dots
                    </documentation>
                </annotation>
            </pattern>
        </restriction>
    </simpleType>
    <complexType name="LegendCodeType">
        <simpleContent>
            <extension base="string">
                <attribute name="codeSpace" type="anyURI">
                    <annotation>
                        <documentation>This attribute, if present serves the same purpose as codeSpace in the GML namespace - if present it shall indicate a dictionary, thesaurus, classification scheme, authority, or pattern for the term.</documentation>
                    </annotation>
                </attribute>
                <attribute ref="xlink:href">
                    <annotation>
                        <documentation>Pointer to the graphic file associated with this legend code. This attribute must be present if the mimeType attribute is used.
</documentation>
                    </annotation>
                </attribute>
                <attribute name="mimeType" type="diggs:mimeTypeEnumExtType">
                    <annotation>
                        <documentation>The mimeType of the legend graphic file identified by the xlink:href attribute</documentation>
                    </annotation>
                </attribute>
            </extension>
        </simpleContent>
    </complexType>
    <simpleType name="hueEnumType">
        <restriction base="string">
            <enumeration value="black"/>
            <enumeration value="tan"/>
            <enumeration value="white"/>
            <enumeration value="blue"/>
            <enumeration value="brown"/>
            <enumeration value="cream"/>
            <enumeration value="red"/>
            <enumeration value="green"/>
            <enumeration value="gray"/>
            <enumeration value="olive"/>
            <enumeration value="orange"/>
            <enumeration value="purple"/>
            <enumeration value="pink"/>
            <enumeration value="buff"/>
            <enumeration value="yellow"/>
        </restriction>
    </simpleType>

    <simpleType name="modifierEnumType">
        <restriction base="string">
            <enumeration value="purplish"/>
            <enumeration value="reddish"/>
            <enumeration value="spotty"/>
            <enumeration value="whitish"/>
            <enumeration value="yellowish"/>
            <enumeration value="bluish"/>
            <enumeration value="brownish"/>
            <enumeration value="creamy"/>
            <enumeration value="greenish"/>
            <enumeration value="grayish"/>
            <enumeration value="mottled"/>
            <enumeration value="olive"/>
            <enumeration value="orange"/>
            <enumeration value="pinkish"/>
        </restriction>
    </simpleType>

    <simpleType name="intensityEnumType">
        <restriction base="string">
            <enumeration value="strong"/>
            <enumeration value="very dark"/>
            <enumeration value="very deep"/>
            <enumeration value="very dusky"/>
            <enumeration value="vivid"/>
            <enumeration value="very light"/>
            <enumeration value="very pale"/>
            <enumeration value="dark"/>
            <enumeration value="deep"/>
            <enumeration value="light"/>
            <enumeration value="medium dark"/>
            <enumeration value="medium"/>
            <enumeration value="medium light"/>
            <enumeration value="mottled"/>
            <enumeration value="dusky"/>
            <enumeration value="pale"/>
            <enumeration value="brilliant"/>
        </restriction>
    </simpleType>
    <simpleType name="hueEnumExtType">
        <union memberTypes="diggs:hueEnumType diggs:OtherNameType"/>
    </simpleType>
    <simpleType name="modifierEnumExtType">
        <union memberTypes="diggs:modifierEnumType diggs:OtherNameType"/>
    </simpleType>
    <simpleType name="intensityEnumExtType">
        <union memberTypes="diggs:intensityEnumType diggs:OtherNameType"/>
    </simpleType>
    <complexType name="ComponentPropertiesType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>

                    <element name="remark" type="diggs:RemarkPropertyType" minOccurs="0"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.Any comment or remark associated with this specific
                                feature, the person or organization making the comment, and the time
                                comment was made.</documentation>
                        </annotation>
                    </element>
                    <choice>
                        <annotation>
                            <documentation>apparentDensity is used for granular soils, consistency used for fine-grained soil. Both cannot be used in the context of a single lithology class.</documentation>
                        </annotation>
                        <element name="apparentDensity" type="gml:CodeType" minOccurs="0">
                            <annotation>
                                <documentation>A text string describing the relative density of intact coarse-grained soils. Common terms are very Loose, loose, medium dense, dense, very Dense; intended to come from a controlled list</documentation>
                            </annotation>
                        </element>
                        <element name="consistency" type="gml:CodeType" minOccurs="0">
                            <annotation>
                                <documentation>A text string describing the consistency of intact fine-grained soils. Common terms are very soft, soft, firm, hard or very hard; intended to come from a controlled list</documentation>
                            </annotation>
                        </element>
                    </choice>
                    <choice minOccurs="0">
                        <element name="beddingOrientation" type="diggs:DiggsStringType"
                            minOccurs="1">
                            <annotation>
                                <documentation>A text string describing the bedding orientationfor stratified material (eg. horizontal, inclined, inclined). If quantitative strike and or dip data is available, dipAngle and dipDirection properties instead.
</documentation>
                            </annotation>
                        </element>
                        <choice>
                            <sequence>
                                <element name="dipAngle" type="diggs:DipMeasureType"/>
                                <element minOccurs="0" name="dipDirection"
                                    type="eml:PlaneAngleMeasure"/>
                            </sequence>
                            <element minOccurs="1" name="dipDirection" type="eml:PlaneAngleMeasure"
                            />
                        </choice>
                    </choice>
                    <element name="beddingSpacing" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>For stratified material, this property records the average thickness between beds as either a descriptive term (eg. thick, thin, etc., from a controlled list of terms, or as a string representation of a numeric value (eg. 10 cm).</documentation>
                        </annotation>
                    </element>
                    <element name="cementation" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A text string describing the degree of cementation of intact coarse-grained soils. Common values are weak, moderate, or strong; intended to come from a controlled list</documentation>
                        </annotation>
                    </element>
                    <element name="dilatancy" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A text string describing the degree of dilantancy of fine grained soils. Common terms are none, slow, rapid; intended to come from a controlled list</documentation>
                        </annotation>
                    </element>
                    <element name="dryStrength" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A text string describing the degree of dry strength. common terms are none, low, medium, high, very high; intended to come from a controlled list</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="fabric" type="gml:CodeType" maxOccurs="1">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the spatial arrangement of grains, Common terms are random, oriented, imbricated, etc. Intended to come from a controlled list of terms.
I</documentation>
                        </annotation>
                    </element>
                    <element name="moistureCondition" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A text string describing the moisture of the soil, Common values are dry, moist, or wet; intended to come from a controlled list</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="particleAngularity" type="gml:CodeType"
                        maxOccurs="1">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the overall
angularity of coarse-grained particles. Common terms are angular, subangular, subrounded, rounded). Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="particleHardness" type="diggs:SizeClassCodeType"
                        maxOccurs="1">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the overall
                                hardness of sand and coarser particles by how the particles react to a hammer blow. Common terms are crack, fracture, or crumble. Hard is typically used if no cracking occurs. Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="particleShape" type="gml:CodeType" maxOccurs="1">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the overall
                                shape of (typically) gravel and larger particles particles. Common terms are flat, elongated, and flat and elongated. Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="particleSize" type="gml:CodeType" maxOccurs="1">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the overall particle size distribution of sand and coarser material, eg. "fine", "fine to coarse", "medium. Intended to come from a controlled list. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="particleSizeDistribution"
                        type="diggs:ParticleSizeDistributionPropertyType" maxOccurs="1">
                        <annotation>
                            <documentation>Particle size distribution information providing details such as mean grain size, maximum grain size, etc. As opposed to Properties in this object support quantitative values derived from laboratory analyses can carry descriptive terms. Detailed properties of a grain size distribution curve should be reported as test results of a ParticleSizeTest</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="particleSorting" type="gml:CodeType"
                        maxOccurs="unbounded">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                particle sorting of soil or rock particles, eg. "well-sorted". Intended to come
                                from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="plasticity" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative plasticity of fine-grained soil. Common terms are low, medium, high. Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element name="reactionToHCl" type="gml:CodeType" minOccurs="0">
                        <annotation>
                            <documentation>A text string describing the soil's reaction to HCl. Common terms are none, weak, or strong; intended to come from a controlled list</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockGrainSize" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the overall
                                particle size or crystal size distribution of the rock, depending on
                                rock origin. For example, for cystalline igneous or metamorphic
                                rocks, terms such as pegmatitic or aphanitic may be used. For
                                clastic sedimentary rocks, terms such as fine sand or cobbles may be
                                used, and for pyroclastic igneous rocks, terms such as "coarse ash"
                                or "lapili" may be used. Intended to come from a controlled list of
                                terms.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockHardness" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                hardness of rock, as governed by its mineralogy, eg. "hard".
                                Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockMass" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the structural
                                features that constitute mechanical discontinuities (major
                                geological features). Rock mass refers to any in situ rock with all
                                inherent geomechanical discontinuities (eg. fissile, blocky,
                                fractured, etc.) </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockSlakingRate" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                rate of slaking of rock, eg. "slow". Intended to come from a
                                controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockStrength" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                hardness of rock, as governed by its compressive strengh, eg.
                                "strong". Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="rockWeathering" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                degree of rock weathering, eg. "slightly decomposed", "Grade III",
                                etc. Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="soilStructure" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                structure of intact soil. Common terms are stratified, laminated, fissured, slickensided, blocky, lensed, homogeneous, varved, etc. Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="staining" type="gml:CodeType">
                        <annotation>
                            <documentation>A term describing the source of any visible staining of the lithologic unit within the area of observation. Possible terms include iron, manganese, hydrocarbons, etc. Intended to come from a controlled list of terms.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="surfaceTexture" type="gml:CodeType" maxOccurs="1">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the microscale features on grain surfaces. Common terms include: polished, smooth, pitted, striated, etc. Intended to come from a controlled list of terms.
Includes:</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="toughness" type="gml:CodeType">
                        <annotation>
                            <documentation>A descriptive term or phrase to describe the relative
                                toughness of fine-grained soil when kneaded near the plastic limit. Common termes are low, medium, high. Intended to come from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="otherComponentProperty" maxOccurs="unbounded"
                        type="diggs:ParameterPropertyType">
                        <annotation>
                            <documentation>Used for other properties not listed in the
                                FieldProperties object. Uses name/value pairs of the Parameter
                                object. Eg. name = Additional Description, value = with
                                slag</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="ComponentPropertiesPropertyType">
        <sequence>
            <element ref="diggs:ComponentProperties"/>
        </sequence>
    </complexType>
    <element name="ComponentProperties" type="diggs:ComponentPropertiesType"/>
    <simpleType name="ApproximatorEnumType">
        <annotation>
            <documentation>Enumeration of terms used to indicate approximate quantities or thresholds</documentation>
        </annotation>
        <restriction base="string">
            <enumeration value="about">
                <annotation>
                    <documentation>Indicates a value that is close to but may vary slightly above or below the stated quantity. More informal than "approximately".</documentation>
                </annotation>
            </enumeration>
            <enumeration value="approximately">
                <annotation>
                    <documentation>Formal term indicating a value very close to the stated quantity, with minimal deviation. More precise than "about" or "roughly".</documentation>
                </annotation>
            </enumeration>
            <enumeration value="roughly">
                <annotation>
                    <documentation>Suggests an estimate with potentially significant variance from the stated value. Less precise than "approximately" or "about".</documentation>
                </annotation>
            </enumeration>
            <enumeration value="at least">
                <annotation>
                    <documentation>Specifies a strict minimum threshold, with values equal to or greater than the stated quantity being acceptable.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="greater than">
                <annotation>
                    <documentation>Mathematical/formal version of "more than", indicating values strictly exceeding the specified quantity.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="at most">
                <annotation>
                    <documentation>Specifies a maximum threshold, with values equal to or less than the stated quantity being acceptable.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="less than">
                <annotation>
                    <documentation>Indicates values strictly below the specified quantity, excluding the stated value itself. More formal than general phrases like "under".</documentation>
                </annotation>
            </enumeration>
        </restriction>
    </simpleType>
    <simpleType name="ApproximatorEnumExtType">
        <union memberTypes="diggs:ApproximatorEnumType diggs:OtherNameType"/>
    </simpleType>
    <element name="intensity" type="diggs:intensityEnumExtType">
        <annotation>
            <documentation>The first value in the color description if used. For soils and rock this is typically either a value or chroma term, (eg. pale, dark, brilliant, medium, dusky). From an enumerated list.

</documentation>
        </annotation>
    </element>

    <simpleType name="offsetDirectionEnumType">
        <restriction base="string">
            <enumeration value="left">
                <annotation>
                    <documentation>Offset direction is to the right when facing in the direction of increasing station value.</documentation>
                </annotation>
            </enumeration>
            <enumeration value="right">
                <annotation>
                    <documentation>Offset direction is to the left when facing in the direction of increasing station value.</documentation>
                </annotation>
            </enumeration>
        </restriction>
    </simpleType>
    <simpleType name="offsetDirectionEnumExtType">
        <union memberTypes="diggs:offsetDirectionEnumType diggs:OtherNameType"/>
    </simpleType>
    <element name="Measurement" type="diggs:MeasurementType"/>
    <complexType name="MeasurementType">
        <complexContent>
            <extension base="diggs:AbstractMeasurementType">
                <sequence>
                    <choice>
                        <sequence>
                            <element minOccurs="0" name="samplingTime"
                                type="diggs:TimeIntervalOrInstantPropertyType">
                                <annotation>
                                    <documentation>Describes the time that the result applies to the
                                property of the investigation target. This is often the time of
                                interaction by a sampling activity or measurement procedure with a
                                real-world feature. </documentation>
                                </annotation>
                            </element>
                            <element minOccurs="0" name="resultTime"
                                type="diggs:TimeIntervalOrInstantPropertyType">
                                <annotation>
                                    <documentation>Describes the time when the result became available,
                                typically when the procedure associated with the observation was
                                completed. For some observations this is identical to the
                                samplingTime. However, there are important cases where they differ.
                                Example: Where a measurement is made on a specimen in a laboratory,
                                the samplingTime should record the time the specimen was retrieved
                                from its host, while the resultTime should record the time the
                                laboratory procedure was applied. Example: Where monitoring
                                observation results are post-processed, the resultTime is the
                                post-processing time, while the samplingTime preserves the time of
                                initial interaction with the world. </documentation>
                                </annotation>
                            </element>
                            <element minOccurs="0" name="validTime"
                                type="diggs:TimeIntervalOrInstantPropertyType">
                                <annotation>
                                    <documentation>Describes the time period during which the result is
                                intended to be used.</documentation>
                                </annotation>
                            </element>
                        </sequence>
                        <sequence>
                            <element name="resultLocation" type="diggs:LocationPropertyType"
                                minOccurs="0">
                                <annotation>
                                    <documentation>Identifies the location of the response zone within
                                    the sampling feature that is being monitored. For example, for a
                                    water level measurement, the location would be the depth
                                    interval in the well where perforations are located (or where
                                    water enters the well)</documentation>
                                </annotation>
                            </element>
                        </sequence>
                    </choice>
                    <element name="outcome" type="diggs:TestResultPropertyType">
                        <annotation>
                            <documentation>A property that contains the information about what
                                properties are being measured, the results of the measurement, and
                                the associated locations that the measurement results relate
                                to.</documentation>
                        </annotation>
                    </element>
                    <choice minOccurs="0">
                        <element minOccurs="1" name="procedure"
                            type="diggs:TestProcedurePropertyType" maxOccurs="unbounded"/>
                        <element name="sensor" type="diggs:SensorPropertyType" maxOccurs="unbounded"
                            minOccurs="1"/>
                    </choice>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="DipMeasureType">
        <simpleContent>
            <extension base="eml:PlaneAngleMeasure">
                <attribute name="apparent" type="boolean">
                    <annotation>
                        <documentation>Defines whether the dip angle reported is an apparent dip (true) or a true dip (false or omitted).</documentation>
                    </annotation>
                </attribute>
            </extension>
        </simpleContent>
    </complexType>
    <element name="SpatialResult" substitutionGroup="gml:AbstractCoverage"
        type="diggs:TestResultType">
        <annotation>
            <documentation>An object that contains properties that report the results of a
                test.</documentation>
        </annotation>
    </element>
    <element name="TemporalResult" type="diggs:TemporalResultType"
        substitutionGroup="gml:AbstractCoverage">
        <annotation>
            <documentation>An object that contains properties of a monitoring activity
                result.</documentation>
        </annotation>
    </element>
    <complexType name="TemporalResultType">
        <complexContent>
            <restriction base="gml:AbstractCoverageType">
                <sequence>
                    <element ref="diggs:timeDomain"/>
                    <element ref="diggs:results"/>
                </sequence>
            </restriction>
        </complexContent>
    </complexType>
</schema>