Geophysics.xsd

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns:diggs="http://diggsml.org/schema-dev"
    xmlns:eml="http://www.energistics.org/energyml/data/commonv2"
    xmlns:witsml="http://www.energistics.org/energyml/data/witsmlv2"
    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: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)  
-->
    <import namespace="http://www.opengis.net/gml/3.2" schemaLocation="gml3.2Profile_diggs.xsd"/>
    <import namespace="http://www.energistics.org/energyml/data/commonv2"
        schemaLocation="energistics/2.0/data/common/v2.1/xsd_schemas/EmlAllObjects.xsd"/>
    <element name="GeophysicalProcessing" type="diggs:GeophysicalProcessingType"
        substitutionGroup="diggs:AbstractProcedure">
        <annotation>
            <documentation>A procedure object used to define the moethod(s) involved in proceessing
                gepphysical field data to produce a processed set of results.</documentation>
        </annotation>
    </element>
    <element abstract="true" name="AbstractVolumeSamplingFeature"
        substitutionGroup="diggs:AbstractSamplingFeature"
        type="diggs:AbstractVolumeSamplingFeatureType">
        <annotation>
            <documentation>The head of a substitution group for sampling features with volume (3D)
                geometries.</documentation>
        </annotation>
    </element>
    <complexType abstract="true" name="AbstractVolumeSamplingFeatureType">
        <complexContent>
            <extension base="diggs:AbstractSamplingFeatureType">
                <sequence>
                    <element minOccurs="0" name="referenceEdge"
                        type="diggs:LinearExtentPropertyType"/>
                    <element maxOccurs="1" minOccurs="0" name="featureExtent"
                        type="diggs:AbstractVolumePropertyType">
                        <annotation>
                            <documentation> This element defines the extent of the solid feature
                                using a absolute CRS. This element can be used for visual
                                representations using typical/simple mapping software
                            </documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="relativeFeatureExtent"
                        type="diggs:AbstractVolumePropertyType">
                        <annotation>
                            <documentation> This element defines the polygon extent of the planar
                                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.
                                VectorLinearSpatialReferenceSystem in GML 3.3) </documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="volumeReferencing"
                        type="diggs:VectorLinearSpatialReferenceSystemPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="SurfaceSpaceType">
        <complexContent>
            <extension base="diggs:AbstractPlanarSamplingFeatureType">
                <sequence/>
            </extension>
        </complexContent>
    </complexType>
    <element name="SurfaceSpace" type="diggs:SurfaceSpaceType"
        substitutionGroup="diggs:AbstractPlanarSamplingFeature">
        <annotation>
            <documentation>A generic Diggs 2D sampling feature that represents a surface that
                defines the sampling space. The featureExtent property can be of a PlanarSurface
                geometry (used for simple cross-sections or maps), where the surface is entirely
                coplanar, or a MultiPlanarSurface geometry, where the overall surface consists of
                multiple coplanar patches (used for dog-leg sections or non-complanar
                surfaces).</documentation>
        </annotation>
    </element>
    <complexType name="AbstractVolumePropertyType">
        <complexContent>
            <restriction base="gml:DomainSetType">
                <sequence minOccurs="0">
                    <choice>
                        <element ref="diggs:AbstractVolume"/>
                        <!--
DSB: REMOVED FROM PROFILE
        <element ref="gml:AbstractTimeObject"/>
        
-->
                    </choice>
                </sequence>
                <attributeGroup ref="gml:OwnershipAttributeGroup"/>
                <attributeGroup ref="gml:AssociationAttributeGroup"/>
            </restriction>
        </complexContent>
    </complexType>
    <complexType abstract="true" name="AbstractVolumeType">
        <annotation>
            <documentation>diggs:AbstractSolidType is an abstraction of a solid to support the
                different levels of complexity. The solid may always be viewed as a geometric
                primitive, i.e. is continuous.</documentation>
        </annotation>
        <complexContent>
            <extension base="diggs:AbstractGeometricPrimitiveType">
                <sequence>
                    <element minOccurs="0" name="exterior" type="gml:ShellPropertyType"/>
                    <element maxOccurs="unbounded" minOccurs="0" name="interior"
                        type="gml:ShellPropertyType"/>
                    <element minOccurs="0" name="uncertainty" type="diggs:UncertaintyPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractVolume" type="diggs:AbstractVolumeType"
        substitutionGroup="diggs:AbstractGeometricPrimitive">
        <annotation>
            <documentation>The head of a substitution group for 3D geometries</documentation>
        </annotation>
    </element>
    <complexType name="SolidType">
        <complexContent>
            <extension base="diggs:AbstractVolumeType"> </extension>
        </complexContent>
    </complexType>
    <element name="Solid" substitutionGroup="diggs:AbstractVolume" type="diggs:SolidType">
        <annotation>
            <documentation>A Diggs geometry object that forms the basis for 3-dimensional geometry.
                The extent of a solid is defined by the boundary surfaces. exterior specifies the
                outer boundary, interior the inner boundary of the solid.</documentation>
        </annotation>
    </element>
    <complexType name="ShellType">
        <complexContent>
            <extension base="diggs:AbstractSurfaceType">
                <sequence>
                    <element maxOccurs="unbounded" ref="gml:surfaceMember"/>
                    <element minOccurs="0" name="uncertainty" type="diggs:UncertaintyPropertyType"/>
                </sequence>
                <attributeGroup ref="gml:AggregationAttributeGroup"/>
            </extension>
        </complexContent>
    </complexType>
    <element name="Shell" type="diggs:ShellType" substitutionGroup="diggs:AbstractSurface">
        <annotation>
            <documentation>A shell is used to represent a single connected component of the boundary
                of a 3D solid. Every diggs:surfaceMember references or contains one surface, i.e.
                any element which is substitutable for diggs:AbstractSurface. In the context of a
                shell, the surfaces describe the boundary of the solid. If provided, the
                aggregationType attribute shall have the value "set". </documentation>
        </annotation>
    </element>
    <complexType name="ShellPropertyType">
        <annotation>
            <documentation>A property with the content model of gml:ShellPropertyType encapsulates a
                shell to represent a component of a solid boundary.</documentation>
        </annotation>
        <sequence>
            <element ref="diggs:Shell"/>
        </sequence>
    </complexType>

    <element name="VolumeSpace" substitutionGroup="diggs:AbstractVolumeSamplingFeature"
        type="diggs:VolumeSpaceType">
        <annotation>
            <documentation>A generic Diggs 3D sampling feature that represents a volume that defines
                the sampling space. The featureExtent properties uses Solid
                geometry.</documentation>
        </annotation>
    </element>
    <complexType name="VolumeSpaceType">
        <complexContent>
            <extension base="diggs:AbstractVolumeSamplingFeatureType">
                <sequence/>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="AbstractSurfacePropertyType">
        <complexContent>
            <restriction base="gml:DomainSetType">
                <sequence minOccurs="0">
                    <choice>
                        <element ref="diggs:AbstractSurface"/>
                        <!--
DSB: REMOVED FROM PROFILE
        <element ref="gml:AbstractTimeObject"/>
        
-->
                    </choice>
                </sequence>
                <attributeGroup ref="gml:OwnershipAttributeGroup"/>
                <attributeGroup ref="gml:AssociationAttributeGroup"/>
            </restriction>
        </complexContent>
    </complexType>
    <complexType abstract="true" name="AbstractSurfaceType">
        <annotation>
            <documentation>gml:AbstractSurfaceType is an abstraction of a surface to support the
                different levels of complexity. A surface is always a continuous region of a
                plane.</documentation>
        </annotation>
        <complexContent>
            <extension base="diggs:AbstractGeometricPrimitiveType"/>
        </complexContent>
    </complexType>
    <element abstract="true" name="AbstractSurface" nillable="false"
        substitutionGroup="diggs:AbstractGeometry" type="diggs:AbstractSurfaceType">
        <annotation>
            <documentation>Head of a substitution group for all 2D surface objects.</documentation>
        </annotation>
    </element>
    <element name="PlanarSurface" substitutionGroup="diggs:AbstractSurface" type="diggs:PolygonType">
        <annotation>
            <documentation>A Diggs geometry object that represents a surface that lies within a
                single plain. It's properties are of a polygon with an outer ring and optionally
                multiple inner rings The coordinate points that define all of the rings must be
                coplanar</documentation>
        </annotation>
    </element>
    <complexType name="MultiPlanarSurfaceType">
        <complexContent>
            <extension base="diggs:AbstractSurfaceType">
                <sequence>
                    <element ref="gml:patches"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="MultiPlanarSurface" substitutionGroup="diggs:AbstractSurface"
        type="diggs:MultiPlanarSurfaceType">
        <annotation>
            <documentation>A Diggs geometry object that represents a surface that does not lie
                within a single plane. It contains an array of polygon patches, each of which
                contain and inner and optionally outer ring that define the extent of the patch. All
                of the coordinate points within a patch must be coplanar, and each patch must share
                an edge with an adjacent patch to form a continuous surface. </documentation>
        </annotation>
    </element>
    <complexType name="RectifiedGridType">
        <complexContent>
            <extension base="diggs:GridType">
                <sequence>
                    <element name="origin" type="diggs:PointLocationPropertyType"/>
                    <element maxOccurs="unbounded" name="offsetVector" type="gml:VectorType"/>
                    <element minOccurs="0" name="uncertainty"
                        type="diggs:LocationUncertaintyPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="RectifiedGrid" substitutionGroup="diggs:AbstractGeometry"
        type="diggs:RectifiedGridType"/>
    <element name="Grid" type="diggs:GridType"/>
    <complexType name="GridType">
        <complexContent>
            <extension base="diggs:AbstractGeometryType">
                <sequence>
                    <element name="limits" type="gml:GridLimitsType"/>
                    <choice>
                        <element name="axisLabels" type="gml:NCNameList"/>
                        <element maxOccurs="unbounded" name="axisName" type="string"/>
                    </choice>
                </sequence>
                <attribute name="dimension" type="positiveInteger" use="required"/>
            </extension>
        </complexContent>
    </complexType>
    <element name="gridMappingFunction" substitutionGroup="gml:AbstractObject"
        type="gml:CoverageFunctionType">
        <annotation>
            <documentation>The gridMappingFunction property describes the mapping function from the
                domain to the range for gridded locations. If omitted, the gml:startPoint is assumed
                to be the value of the gml:low property in the gml:Grid geometry, and the
                gml:sequenceRule is assumed to be linear and the gml:axisOrder property is assumed
                to be “+1 +2”.</documentation>
        </annotation>
    </element>
    <element name="geophysicalMethod" type="diggs:geophysicalMethodEnumExtType"/>
    <simpleType name="geophysicalMethodEnumType">
        <annotation>
            <documentation>A controlled list of terms identifying supported field geophysical survey
                methods.</documentation>
        </annotation>
        <restriction base="string">
            <enumeration value="borehole crosshole seismic"/>
            <enumeration value="borehole image log"/>
            <enumeration value="borehole seismic downhole source"/>
            <enumeration value="borehole seismic surface source"/>
            <enumeration value="electrical resistivity tomography (ERT)"/>
            <enumeration value="electromagnetic induction (EMI)"/>
            <enumeration value="frequency domain reflectometry (FDR)"/>
            <enumeration value="gamma-gamma density"/>
            <enumeration value="gamma ray spectrosocpy"/>
            <enumeration value="gravity, absolute"/>
            <enumeration value="gravity, relative"/>
            <enumeration value="ground penetrating radar"/>
            <enumeration value="induced polarization"/>
            <enumeration value="magnetic resonance sounding (MRS)"/>
            <enumeration value="magnetometry"/>
            <enumeration value="magnetotelluric (MT)"/>
            <enumeration value="marine seismic"/>
            <enumeration value="microtremor array measurement (MAM)"/>
            <enumeration value="multichannel analysis of surface waves (MASW)"/>
            <enumeration value="natural gamma radiation"/>
            <enumeration value="neutron logging"/>
            <enumeration value="passive seismic (HVSR)"/>
            <enumeration value="refraction microtremor (ReMi)"/>
            <enumeration value="seismic reflection"/>
            <enumeration value="seismic refraction"/>
            <enumeration value="self-potential"/>
            <enumeration value="spectral analysis of surface waves (SASW)"/>
            <enumeration value="time-domain reflectometry (TDR)"/>
            <enumeration value="transient electromagnetics (TEM)"/>
            <enumeration value="vertical electrical sounding (VES)"/>
            <enumeration value="very low frequency method (VLF)"/>
        </restriction>
    </simpleType>
    <simpleType name="geophysicalMethodEnumExtType" final="">
        <annotation>
            <documentation/>
        </annotation>
        <union memberTypes="diggs:geophysicalMethodEnumType diggs:OtherNameType"/>
    </simpleType>
    <complexType name="ProcessingStepsArrayPropertyType">
        <sequence maxOccurs="unbounded" minOccurs="0">
            <element ref="diggs:ProcessingStep"/>
        </sequence>
    </complexType>
    <element name="ProcessingStep" type="diggs:ProcessingStepType"/>
    <complexType name="ProcessingStepType">
        <complexContent>
            <extension base="gml:AbstractMetadataPropertyType">
                <sequence>
                    <element maxOccurs="unbounded" minOccurs="0" name="associatedFile"
                        type="diggs:AssociatedFilePropertyType">
                        <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
                                processing step. The target value is indicated in the appinfo
                                element.</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
                                processing step.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="equipment"
                        type="diggs:EquipmentPropertyType">
                        <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="timePerformed" type="diggs:TimeIntervalType">
                        <annotation>
                            <documentation>The time or time interval during which the processing
                                step was performed.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="processStepDescription"
                        type="diggs:DiggsStringType">
                        <annotation>
                            <documentation>A narrative description of the processing
                                step</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="processStepName" type="gml:CodeType">
                        <annotation>
                            <documentation>If applicable, a name for this processing
                                step.</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attribute name="index" type="positiveInteger">
                    <annotation>
                        <documentation>This attribute is used to explicitly define the sequence of
                            processing steps, numbered as 1,2,3, etc. in sequence order. If omitted,
                            the processing sequence is assumed to follow the order of the
                            ProcessingStep</documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="GeophysicalProcessingType">
        <complexContent>
            <extension base="diggs:AbstractProcedureType">
                <sequence>
                    <element maxOccurs="unbounded" minOccurs="0" name="equipment"
                        type="diggs:EquipmentPropertyType">
                        <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="geophysicalFieldSurveyRef"
                        type="diggs:FeatureReferenceType">
                        <annotation>
                            <documentation>A reference to the gml:ID, reported in the xlink:href
                                attribute, of the measurement that contains the results obtained
                                during data acquisition and that serves as input into the processing
                                steps that produce the results of this associated
                                measurement</documentation>
                        </annotation>
                    </element>
                    <element ref="diggs:geophysicalMethod" minOccurs="1">
                        <annotation>
                            <documentation>A controlled term for the name of the geophysical survey
                                method used to obtain the associated results.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="processingSteps"
                        type="diggs:ProcessingStepsArrayPropertyType">
                        <annotation>
                            <documentation>An array of processing step objects that describe the
                                steps undertaken to transform the originally acquired geophysical
                                data to the associated processed results</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="GeophysicalFieldSurvey" substitutionGroup="diggs:AbstractMeasurement"
        type="diggs:GeophysicalFieldSurveyType"/>
    <complexType mixed="false" name="GeophysicalFieldSurveyType">
        <complexContent>
            <extension base="diggs:AbstractMeasurementType">
                <sequence>
                    <element minOccurs="0" name="processedGeophysicalResultsRef"
                        type="diggs:FeatureReferenceType">
                        <annotation>
                            <documentation>A reference to the Test feature that holds the
                                measurement results derived from processing the data from this
                                geophysical field survey.</documentation>
                        </annotation>
                    </element>
                    <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:GP_SurveyResultPropertyType">
                        <annotation>
                            <documentation>The property that contains the
                                GP_SurveyResult</documentation>
                        </annotation>
                    </element>
                    <element ref="diggs:geophysicalMethod">
                        <annotation>
                            <documentation>A mandotory property identifying the type of geophysical
                                survey being conducted; from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="procedure"
                        type="diggs:GP_FieldProcedurePropertyType">
                        <annotation>
                            <documentation>The property that contains information about the field
                                procedure (GP_FieldProcedure object).</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="GP_FieldDataFile" type="diggs:AssociatedFileType"/>
    <element name="DataPackage" type="diggs:DataPackageType"/>
    <complexType name="DataPackageType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectType">
                <sequence>
                    <element name="files" type="diggs:FilesArrayPropertyType">
                        <annotation>
                            <documentation>A property containing one or more GP_FieldDataFile
                                objexts</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="DataPackagePropertyType">
        <sequence>
            <element ref="diggs:DataPackage">
                <annotation>
                    <documentation>The DataPackage object contains properties related to the data
                        file or files referenced in the transmission.</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <complexType name="FilesArrayPropertyType">
        <sequence maxOccurs="unbounded">
            <element ref="diggs:GP_FieldDataFile">
                <annotation>
                    <documentation>An object containing properties of the field data file being
                        referenced.</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <element name="GP_ArealSurvey" substitutionGroup="diggs:AbstractPlanarSamplingFeature"
        type="diggs:GP_ArealSurveyType"/>
    <complexType name="GP_ArealSurveyType">
        <complexContent>
            <extension base="diggs:AbstractPlanarSamplingFeatureType">
                <sequence>
                    <element name="sensorMix" type="diggs:SensorMixEnumType">
                        <annotation>
                            <documentation>Describes the kind of sensors that are located within the
                                areal survey; from an enumerated list. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="totalSurveyArea" type="eml:AreaMeasure">
                        <annotation>
                            <documentation>The total area of the survey</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="GP_Trackline" substitutionGroup="diggs:AbstractLinearSamplingFeature"
        type="diggs:GP_TracklineType">
        <annotation>
            <documentation>A linear sampling feature that records the geographic location of a
                geophysical survey that can be modeled as a single linestring - such as a
                ground-surface transect, marine trackline, or airborne flightline, where receivers
                (and optionally source devices) are placed on or moved along the track. This differs
                from the more general Transect sampling feature insofar as its use implies
                association with a GeophysicalFieldSurvey measurement as well as possibly being
                associated with other GP_Trackline features as part of a GP_Multitrack sampling
                feature. As with all linear sampling features, the geometry is specified by the
                centerline property using 2D or 3D coordinates within a known geographic or
                projected coordinate system. Allthough not required, where possible the centerline
                vertices should occur at specific receiver locations where measurements are obtained
                or at measurement locations for a receiver that is moving along the track (ordered
                in the direction of movement). </documentation>
        </annotation>
    </element>
    <complexType name="GP_TracklineType">
        <complexContent>
            <extension base="diggs:AbstractLinearSamplingFeatureType">
                <sequence>
                    <element name="sensorMix" type="diggs:SensorMixEnumType">
                        <annotation>
                            <documentation>Describes the kind of sensors that are located along the
                                trackline; from an enumerated list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="whenTracklineOccupied"
                        type="diggs:TimeIntervalPropertyType">
                        <annotation>
                            <documentation>The time interval during which receivers were deployed
                                along the trackline.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="totalTracklineLength" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The total length of the trackline.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="GP_MultiTrack" substitutionGroup="diggs:AbstractSamplingFeature"
        type="diggs:GP_MultiTrackType"/>
    <complexType name="GP_MultiTrackType">
        <complexContent>
            <extension base="diggs:AbstractSamplingFeatureType">
                <sequence>
                    <element name="trackline" type="diggs:GP_TracklinePropertyType"
                        maxOccurs="unbounded" minOccurs="2"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="GP_TracklinePropertyType">
        <sequence maxOccurs="1">
            <element ref="diggs:GP_Trackline"/>
        </sequence>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
    </complexType>
    <complexType name="ConfigurationArrayPropertyType">
        <sequence maxOccurs="unbounded">
            <element ref="diggs:Configuration"/>
        </sequence>
    </complexType>
    <complexType name="ConfigurationType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element minOccurs="0" ref="gml:description"/>
                    <element maxOccurs="unbounded" minOccurs="0" name="remark"
                        type="diggs:RemarkPropertyType"/>
                    <element name="receiverInfo" type="diggs:ReceiverInfoArrayPropertyType">
                        <annotation>
                            <documentation>An array property type containing one or more
                                ReceiverInfo objects.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="sourceInfo"
                        type="diggs:SourceInfoArrayPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Configuration" type="diggs:ConfigurationType">
        <annotation>
            <documentation>A configuration is a geometric arrangement of discrete receiver locations
                or receiver and source locations (modeled as point geometries). A
                GeophysicalFieldSurvey may consist of more than one configuration where a single
                configuration may not extend over the entire set of associated sampling features.
                For example a seismic reflection survey may consist of one or more source-receiver
                arrays that are moved progressively along a GP_Trackline. In this case, each array
                location would be described by a Configuration object.</documentation>
        </annotation>
    </element>
    <complexType name="PlatformArrayPropertyType">
        <sequence maxOccurs="unbounded">
            <element ref="diggs:Platform"/>
        </sequence>
    </complexType>
    <complexType name="PlatformType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element minOccurs="0" ref="gml:description"/>
                    <element maxOccurs="unbounded" minOccurs="0" ref="gml:name"/>
                    <element maxOccurs="unbounded" minOccurs="0" name="remark"
                        type="diggs:RemarkPropertyType"/>
                    <element minOccurs="1" name="receiverType" type="diggs:receiverTypeEnumExtType">
                        <annotation>
                            <documentation>The type of receiver used in this platform; from a
                                controlled list. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="noReceivers" type="nonNegativeInteger">
                        <annotation>
                            <documentation>Th number of receivers in the platform </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="receiverArrayOrientation"
                        type="diggs:platformOrientationEnumType">
                        <annotation>
                            <documentation>The orientation of the receiver array relative to the
                                direction of platform travel. From a controlled
                                list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="receiverSpacing"
                        type="diggs:SensorSpacingPropertyType">
                        <annotation>
                            <documentation>Where a platform has 2 or more receivers, this property
                                records the spacing between them. If receiver spacing is not regular
                                this value can be the average spacing. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="1" name="sourceType" type="diggs:sourceTypeEnumExtType">
                        <annotation>
                            <documentation>The type of source used for the platform; from a
                                controlled list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="noSources" type="nonNegativeInteger">
                        <annotation>
                            <documentation>The number of sources in the platform</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="sourceReceiverOrientation"
                        type="diggs:platformOrientationEnumType">
                        <annotation>
                            <documentation>The orientation of the source receiver array relative to
                                the direction of platform travel. From a controlled
                                list.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="minSourceReceiverSpacing" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The minimum spacing between source and receiver in the
                                platform</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="maxSourceReceiverSpacing" type="eml:LengthMeasure">
                        <annotation>
                            <documentation>The maximum spacing between source and receiver in the
                                platform</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="platformMovement"
                        type="diggs:PlatformGeometryArrayPropertyType">
                        <annotation>
                            <documentation>A property type containing one or more PlatformMovement
                                objects that describes the platform veloicity, sampling rate and
                                optionally the locations of the platform on a sampling
                                feature</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="Platform" type="diggs:PlatformType">
        <annotation>
            <documentation>A platform is a geometric arrangement of receivers and optionally a
                source that that are in fixed position relative to each other, and where the entire
                geometric arrangement moves together for the survey. Platforms are also used where a
                receiver or receiver configuration moves continuously and where measurements are
                taken at discrete time intervals. Examples of geophysical methods that use platforms
                are: GPR, magnetic surveys on moving platforms (aeromag), marine seismic, borehole
                seismic.</documentation>
        </annotation>
    </element>
    <simpleType name="receiverTypeEnumType">
        <annotation>
            <documentation>1) accelerometer: an instrument for measuring acceleration of the earth.
                2) electrode: a device set up (typically a pair of metal rods with a voltmeter
                connecting the two) for measuring the electrical potential difference in the earth
                between the electrode pair. 3) Geiger-Muller counter: a device for measuring
                radioactivity by detecting and counting ionizing particles. 4) geophone: a device
                that measures velocity by converting ground movement into voltage. 5)gravimeter: an
                instrument used to measure gravitational acceleration. 6) hydrophone: a microphone
                designed to be used underwater for recording or listening to underwater sound. 7)
                magnetometer: an instrument for measuring the strength and direction of magnetic
                fields, 8) RF coil: a receiver of radiofrequency signals in equipment used in
                magnetic resonance and electromagnetic induction methods. 9) radio wave antenna: an
                antenna attached to a receiver used to detect radio waves (a type of electromagnetic
                radiation with frequencies of 300 gigahertz (GHz) and below). 10) scintillation
                detector: an instrument for detecting and measuring ionizing radiation by using the
                excitation effect of incident radiation on a scintillating material, and detecting
                the resultant light pulses. 11) seismometer: an instrument used to measure ground
                motions by detecting relative movement between a "stationary" mass and a frame
                coupled to the earth. Typically seismometers contain sensors to measure motions on
                multiple axes. 12) sodium iodide detector: a device for measuring gammma radiation
                at various frequencies that uses sodium iodide as the detector. 13) VLF receiver
                antenna: an antenna designed to detect radio frequencies in the range of 3-30 kHz.
            </documentation>
        </annotation>
        <restriction base="string">
            <enumeration value="accelerometer"/>
            <enumeration value="electrode"/>
            <enumeration value="Geiger-Muller counter"/>
            <enumeration value="geophone"/>
            <enumeration value="gravimeter"/>
            <enumeration value="hydrophone"/>
            <enumeration value="magnetometer"/>
            <enumeration value="RF coil"/>
            <enumeration value="radio wave antenna"/>
            <enumeration value="scintillation detector"/>
            <enumeration value="seismometer"/>
            <enumeration value="sodium iodide detector"/>
            <enumeration value="VLF receiver antenna"/>
        </restriction>
    </simpleType>
    <simpleType name="receiverTypeEnumExtType">
        <union memberTypes="diggs:receiverTypeEnumType diggs:OtherNameType"/>
    </simpleType>
    <simpleType name="sourceTypeEnumType">
        <annotation>
            <documentation>1) impulsive - an energy source of short duration that is repeatable and
                does not generate noise that interferes with detection. 2) nonimpulsive - an energy
                source transmitted into the ground for an extended period of time. </documentation>
        </annotation>
        <restriction base="string">
            <enumeration value="impulsive"/>
            <enumeration value="nonimpulsive"/>
        </restriction>
    </simpleType>
    <simpleType name="sourceTypeEnumExtType">
        <union memberTypes="diggs:sourceTypeEnumType diggs:OtherNameType"/>
    </simpleType>
    <simpleType name="GP_MeasurementEnumType">
        <annotation>
            <documentation>Type currently not used; reserved for possible extension </documentation>
        </annotation>
        <restriction base="string">
            <enumeration value="chargeability"/>
            <enumeration value="magnetic field strength"/>
            <enumeration value="decay rate"/>
            <enumeration value="electric field strength"/>
            <enumeration value="electrical conductivity"/>
            <enumeration value="electrical potential"/>
            <enumeration value="electrical resistivity"/>
            <enumeration value="EM  amplitude"/>
            <enumeration value="EM  frequency"/>
            <enumeration value="gamma count rate"/>
            <enumeration value="gravitational acceleration"/>
            <enumeration value="magnetic field strength"/>
            <enumeration value="magnetic susceptibility"/>
            <enumeration value="neutron count rate"/>
            <enumeration value="NMR signal amplitude"/>
            <enumeration value="phase angle"/>
            <enumeration value="phase velocity"/>
            <enumeration value="radiowave antenna"/>
            <enumeration value="reflection coefficient"/>
            <enumeration value="relaxtion time"/>
            <enumeration value="spectral distribution"/>
            <enumeration value="transmitter coil"/>
            <enumeration value="travel time"/>
            <enumeration value="wave amplitude"/>
            <enumeration value="wave frequency"/>
        </restriction>
    </simpleType>
    <simpleType name="GP_MeasurementEnumExtType">
        <union memberTypes="diggs:GP_MeasurementEnumType diggs:OtherNameType"/>
    </simpleType>
    <element name="GP_SurveyResult" type="diggs:GP_SurveyResultType"/>
    <complexType abstract="false" name="GP_SurveyResultBaseType">
        <complexContent>
            <restriction base="diggs:AbstractFeatureBaseType">
                <sequence> </sequence>
            </restriction>
        </complexContent>
    </complexType>
    <complexType abstract="false" name="GP_SurveyResultType">
        <complexContent>
            <extension base="diggs:GP_SurveyResultBaseType">
                <sequence>
                    <element minOccurs="0" name="gp_Location" type="diggs:GP_LocationPropertyType"
                        maxOccurs="1">
                        <annotation>
                            <documentation>A property that provides the receiver and (optionally)
                                source locations for the field survey. This property is not used if
                                receiver and source geometries are included in the GP_FieldProcedure
                                object</documentation>
                        </annotation>
                    </element>
                    <element name="dataPackage" type="diggs:DataPackagePropertyType" minOccurs="0">
                        <annotation>
                            <documentation>A property type containing a DataPackage object.
                                Normally, a DataPackage should be transmitted with the
                                GeophysicalFieldSurvey. If not, gp_Locstion must be instanntiated to
                                identify locations of sources and receivers used, as one property of
                                the GP_SurveyResult.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" ref="diggs:gridMappingFunction"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="GP_SurveyResultPropertyType">
        <sequence>
            <element ref="diggs:GP_SurveyResult">
                <annotation>
                    <documentation>SurveyReult contains properties about the receiver and source
                        locations and pointers to field data </documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <complexType name="GP_SensorLocationsPropertyType">
        <choice minOccurs="0">
            <element ref="diggs:PointLocation"/>
            <element ref="diggs:MultiPointLocation"/>
            <element ref="diggs:RectifiedGrid"/>
        </choice>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
    </complexType>
    <element name="GP_Location" type="diggs:GP_LocationType"/>
    <complexType name="GP_LocationType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence minOccurs="1">
                    <element maxOccurs="unbounded" name="receiverLocations"
                        type="diggs:GP_SensorLocationsPropertyType">
                        <annotation>
                            <documentation>A property that reports the location of geophysical
                                sensors (receivers) where a receivef location is repreaented by a
                                point with coordinates reported in either a well known geographic or
                                projected coordinate reference system, or in a linear or vector
                                linear spatial reference system associated with a smpling feature.
                                Multiple receiverLocations are permitted to allow for the reporting
                                of receiver locations within multiple linear of vector linear
                                spatial reference systems. Locations are reported in Point,
                                MuitiPoint or RecifiedGrid objects representing a single location,
                                multiple locations, or regularly spaced multiple locations,
                                respecitvely.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="sourceLocations"
                        type="diggs:GP_SensorLocationsPropertyType">
                        <annotation>
                            <documentation>A property that reports the location of energy sources
                                where a source location is repreaented by a point with coordinates
                                reported in either a well known geographic or projected coordinate
                                reference system, or in a linear or vector linear spatial reference
                                system associated with a smpling feature. Multiple sourceLocations
                                are permitted to allow for the reporting of source locations within
                                multiple linear or vector linear spatial reference systems.
                                Locations are reported in Point, MuitiPoint or RecifiedGrid objects
                                representing a single location, multiple locations, or regularly
                                spaced multiple locations, respecitvely.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="GP_LocationPropertyType">
        <sequence>
            <element ref="diggs:GP_Location"/>
        </sequence>
    </complexType>
    <element name="GP_MeasurementProperties" type="diggs:GP_MeasurementPropertiesType"/>
    <complexType name="GP_MeasurementPropertiesType">
        <sequence minOccurs="1" maxOccurs="1">
            <element maxOccurs="unbounded" name="gp_measurementProperty"
                type="diggs:GP_MeasurementEnumExtType"/>
        </sequence>
    </complexType>
    <complexType name="GP_MeasurementPropertiesPropertyType">
        <annotation>
            <documentation>Unused, reserved for possible extension</documentation>
        </annotation>
        <sequence>
            <element ref="diggs:GP_MeasurementProperties">
                <annotation>
                    <documentation>Unused, reserved for possible extension. </documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <element name="GP_FieldProcedure" type="diggs:GP_FieldProcedureType"
        substitutionGroup="diggs:AbstractInsituTestProcedure">
        <annotation>
            <documentation>An procedure object that describes the components of a geophysical field
                survey, including details about the receiver and source equipment, data acquisition
                system, recording parameters, and source-receiver configurations or platform
                geometries.</documentation>
        </annotation>
    </element>
    <complexType name="GP_FieldProcedureType">
        <complexContent>
            <extension base="diggs:AbstractInsituTestProcedureType">
                <sequence>
                    <element minOccurs="0" name="receiverEquipment"
                        type="diggs:ReceiverEquipmentPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>A property type containing a receiver equipment
                                object</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="sourceEquipment"
                        type="diggs:SourceEquipmentPropertyType" maxOccurs="unbounded">
                        <annotation>
                            <documentation>A property type containing a source equipment
                                object.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="dataAcquisitionSystem"
                        type="diggs:DataAcquisitionSystemPropertyType">
                        <annotation>
                            <documentation>A property type containing a data acquisition system
                                object describiing the properties of the recording
                                system.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="recordingParameters"
                        type="diggs:ParameterArrayPropertyType">
                        <annotation>
                            <documentation>Am arrau property type containing one or more Parameter
                                objects to define the various recording parameters set for the data
                                acquisition system for this procedure.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="1" minOccurs="0" name="configurations"
                        type="diggs:ConfigurationArrayPropertyType">
                        <annotation>
                            <documentation>An array property type containing one or more
                                Configuration objects used to define the receiver or source-receiver
                                configuration(s) for the survey.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="platforms" type="diggs:PlatformArrayPropertyType">
                        <annotation>
                            <documentation>An array property type containing one or more Platform
                                objects used for the survey.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="ReceiverInfo" type="diggs:ReceiverInfoType">
        <annotation>
            <documentation>Contains properties about the receivers and receiver locations associated
                with a single GP_Trackline or GP_ArealSurvey sampling feature in this configuration.
                If no specific receiver geometry is included, information about the spacing and
                number of receivers can be provided using the receiverInterval and
                noReceiverStations properties. If detailed information about specific receivers and
                their locations are provided, the receiverGeometry propoerty is used, If
                receiverGeometry is used, at least one GP_Receiver object must
                exist.</documentation>
        </annotation>
    </element>
    <complexType name="ReceiverInfoType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element minOccurs="0" ref="gml:description"/>
                    <element maxOccurs="unbounded" minOccurs="0" name="remark"
                        type="diggs:RemarkPropertyType"/>
                    <element minOccurs="1" ref="diggs:samplingFeatureRef"/>
                    <element minOccurs="0" name="receiverType" type="diggs:receiverTypeEnumExtType">
                        <annotation>
                            <documentation>This element identifies the type of receiver(s) used in
                                this configuration. It is optional, but should be instantiated when
                                receiverGeometry is not used. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="receiverSpacing"
                        type="diggs:SensorSpacingPropertyType">
                        <annotation>
                            <documentation>The average, minimum, and/or maximum spacing between
                                receivers in this configuration.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="noReceiverStations" type="positiveInteger">
                        <annotation>
                            <documentation>The number of receiver stations used in this
                                configuration; ie., the number of locations where measurements were
                                obtained using this configuration.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="noReceivers" type="positiveInteger">
                        <annotation>
                            <documentation>The number of receiver instruments used in this
                                configuration</documentation>
                        </annotation>
                    </element>
                    <element name="receiverLocations" type="diggs:ReceiverLocationsPropertyType"
                        minOccurs="0">
                        <annotation>
                            <documentation>Contains one or more ReceiversDetails objects describing
                                specific receiver instruments and their locations.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="ReceiverInfoArrayPropertyType">
        <sequence maxOccurs="unbounded">
            <element ref="diggs:ReceiverInfo">
                <annotation>
                    <documentation>Contains properties about the receivers and receiver locations
                        associated with a single GP_Trackline or GP_ArealSurvey sampling feature in
                        this configuration. If no specific receiver geometry is included,
                        information about the spacing and number of receivers can be provided using
                        the receiverInterval and noReceiverStations properties. If detailed
                        information about specific receivers and their locations are provided, the
                        receiverGeometry propoerty is used, If receiverGeometry is used, at least
                        one GP_Receiver object must exist.</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <complexType name="GP_FieldProcedurePropertyType">
        <sequence>
            <element ref="diggs:GP_FieldProcedure">
                <annotation>
                    <documentation>An object containing properties related to the field survey
                        procedure, including receiver, source and data aquisition equipment used,
                        recording parameters, and the source-receiver configurations or
                        platforms</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <simpleType name="SensorMixEnumType">
        <annotation>
            <documentation>1) common mid-point: the sampling feature represents measurement
                locations that are located midway between sources and receivers. 2) mixed: both
                sources and receivers are located on the sampling feature. 3) receivers: the
                sampling feature represents receiver locations only. 4) sources: the sampling
                feature represents source locations only.</documentation>
        </annotation>
        <restriction base="string">
            <enumeration value="common mid-point"/>
            <enumeration value="receivers"/>
            <enumeration value="mixed"/>
            <enumeration value="sources"/>
        </restriction>
    </simpleType>
    <element name="ReceiverLocations" type="diggs:ReceiverLocationsType">
        <annotation>
            <documentation>An object that contains properties of the receiver locations and
                references to the receiver objects.</documentation>
        </annotation>
    </element>
    <complexType name="ReceiverLocationsPropertyType">
        <sequence maxOccurs="1" minOccurs="0">
            <element ref="diggs:ReceiverLocations">
                <annotation>
                    <documentation>An object that contains details about specific receiver
                        instruments and their locations in this configuration. The object contains
                        two properties: receiverRef and receiverLocations. receiverRef references a
                        sincle GP_Receiver object. If only one GP_Receiver object is listed, then
                        the receiverLocations property may contain any of PointLocation,
                        MultiPointLocation or RecifiedGrid geometries. If MultiPointLocation or
                        RectifiedGrid is used, then either the GP_Receiver identified is
                        successively moved to all locations of the geometry or the GP_Receiver
                        represents a class of receivers with identical properties that are installed
                        at each location. This distinction is identified in the GP_Receiver object.
                        If more than one GP_Receiver is referenced, then use of the PointLocation
                        geometry implies that all receivers are located at the same point location.
                        If MultiPointLocation or RectifiedGrid geometries are used, then there must
                        be the same number of individual locations in the geometry as there are
                        GF_Receiver objects referenced, and the individual locations must be in
                        GP_Receiver order so that each receiver's location can be
                        determined.</documentation>
                </annotation>
            </element>
        </sequence>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
    </complexType>
    <complexType name="ReceiverLocationsType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element maxOccurs="unbounded" name="receiverRef"
                        type="diggs:FeatureReferenceType">
                        <annotation>
                            <documentation>A reference to a GP_Receiver object's gml:ID. At least
                                one GP_Receiver object must exist. If multiple receiverRef
                                properties are used the sourceLocations property must contain either
                                a MultiPointLocation or RectifiedGrid object and the order of the
                                tuples must correspond with the order of the receiverRef properties
                                within the instance. </documentation>
                        </annotation>
                    </element>
                    <element name="locations" type="diggs:GP_SensorLocationsPropertyType"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="GP_Receiver" substitutionGroup="diggs:AbstractGP_Receiver"
        type="diggs:GP_ReceiverType">
        <annotation>
            <documentation>A generic field survey receiver object containing properties of a
                receiver.</documentation>
        </annotation>
    </element>
    <complexType name="GP_ReceiverType">
        <complexContent>
            <extension base="diggs:AbstractGP_ReceiverType">
                <sequence> </sequence>
            </extension>
        </complexContent>
    </complexType>
    <element name="AbstractGP_Receiver" type="diggs:AbstractGP_ReceiverType" abstract="true">
        <annotation>
            <documentation>The head of a substitution group for receiver equipment.</documentation>
        </annotation>
    </element>
    <complexType name="AbstractGP_ReceiverType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractEquipmentType">
                <sequence>
                    <element minOccurs="1" name="receiverType" type="diggs:receiverTypeEnumExtType">
                        <annotation>
                            <documentation>The type of receiver. This is a mandatory term that comes
                                from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element name="isGroup" type="diggs:isReceiverGroupType">
                        <annotation>
                            <documentation>if isGroup is true, this implies that the properties of
                                this receiver object apply to more than one individual receivers.
                                Where true, the noReceivers attribute must be instantiated with the
                                total number of individual receivers that belong to the group.
                                isGroup is used where there are multiple identical receivers (such
                                as electrodes or geophones) that are identical and do not need to be
                                identified individually in configurations or platforms. If false,
                                this indicates that the object consists of only one piece of
                                equipment.</documentation>
                        </annotation>
                    </element>
                    <element maxOccurs="unbounded" minOccurs="0" name="detector"
                        type="diggs:GP_DetectorPropertyType">
                        <annotation>
                            <documentation>An array propoerty type containing one or more
                                GP_Detector objects. </documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>

    <complexType name="isReceiverGroupType">
        <simpleContent>
            <extension base="boolean">
                <attribute name="noRecevers" type="positiveInteger">
                    <annotation>
                        <documentation>Where isGroup is true, identifies the
                            number of receivers in the group that share
                            identical properties</documentation>
                    </annotation>
                </attribute>
            </extension>
        </simpleContent>
    </complexType>
    <element name="GP_Detector" type="diggs:GP_DetectorType">
        <annotation>
            <documentation>Am object that holds properties of a receiver detector - the specific
                sensor within the receiver.</documentation>
        </annotation>
    </element>
    <complexType name="GP_DetectorPropertyType">
        <sequence maxOccurs="1">
            <element ref="diggs:GP_Detector">
                <annotation>
                    <documentation/>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <complexType name="GP_DetectorType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element maxOccurs="1" minOccurs="0" name="measurand"
                        type="gml:CodeWithAuthorityType">
                        <annotation>
                            <documentation>Contains the name of the property being measured and
                                reported to the data package. Intended to come from a controlled
                                list of termsm the authority or pointer to a properties dictionary
                                that defines the name used is required as the value of the codeSpace
                                attribute. </documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="recordingSpace"
                        type="diggs:RecordingSpaceEnumExtType">
                        <annotation>
                            <documentation>A term that describes the recording space for the
                                detector - a controlled term. </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>
    <simpleType name="RecordingSpaceEnumType">
        <annotation>
            <documentation>1) frequency domain - the recorded values are vary with frequency 2)
                non-varying - the recorded values do not vary with frequency or time 3) time-domain
                - the recorded values vary with time</documentation>
        </annotation>
        <restriction base="string">
            <enumeration value="frequency domain"/>
            <enumeration value="non-varying"/>
            <enumeration value="time domain"/>
        </restriction>
    </simpleType>
    <simpleType name="RecordingSpaceEnumExtType">
        <union memberTypes="diggs:OtherNameType diggs:RecordingSpaceEnumType"/>
    </simpleType>
    <element name="GP_Source" substitutionGroup="diggs:AbstractGP_Source" type="diggs:GP_SourceType">
        <annotation>
            <documentation>A generic field survey source object containing properties of a
                source.</documentation>
        </annotation>
    </element>
    <complexType name="GP_SourceType">
        <complexContent>
            <extension base="diggs:AbstractGP_SourceType">
                <sequence/>
            </extension>
        </complexContent>
    </complexType>
    <element name="AbstractGP_Source" type="diggs:AbstractGP_SourceType" abstract="true">
        <annotation>
            <documentation>The head of a substitution group for source equipment.</documentation>
        </annotation>
    </element>
    <complexType name="AbstractGP_SourceType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractEquipmentType">
                <sequence>
                    <element name="sourceType" type="diggs:sourceTypeEnumExtType">
                        <annotation>
                            <documentation>The type of source. This is a mandatory term that comes
                                from a controlled list.</documentation>
                        </annotation>
                    </element>
                    <element name="isGroup" type="diggs:isSourceGroupType">
                        <annotation>
                            <documentation>if isGroup is true, this implies that the properties of
                                this source object apply to more than one individual sources. Where
                                true, the noSources attribute must be instantiated with the total
                                number of individual sources that belong to the group. isGroup is
                                used where there are multiple identical soureces that are identical
                                and do not need to be identified individually in configurations or
                                platforms. If false, this indicates that the object consists of only
                                one piece of equipment.</documentation>
                        </annotation>
                    </element>
                </sequence>
                <attributeGroup ref="gml:AssociationAttributeGroup"/>
                <attributeGroup ref="gml:OwnershipAttributeGroup"/>
            </extension>
        </complexContent>
    </complexType>

    <complexType name="isSourceGroupType">
        <simpleContent>
            <extension base="boolean">
                <attribute name="noSources" type="positiveInteger">
                    <annotation>
                        <documentation>Where isGroup is true, identifies the
                            number of sources in the group that share identical
                            properties</documentation>
                    </annotation>
                </attribute>
            </extension>
        </simpleContent>
    </complexType>

    <element abstract="false" name="SourceInfo" type="diggs:SourceInfoType">
        <annotation>
            <documentation>Contains properties about the sources and source locations associated
                with a single GP_Trackline or GP_ArealSurvey sampling feature in this configuration.
                If no specific source geometry is included, information about the spacing and number
                of sources can be provided using the sourceInterval and noSourceStations properties.
                If detailed information about specific sources and their locations are provided, The
                sourceGeometry property is used, If sourceGeometry is used, at least one GP_Source
                object must exist.</documentation>
        </annotation>
    </element>
    <complexType name="SourceInfoType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element minOccurs="0" ref="gml:description"/>
                    <element maxOccurs="unbounded" minOccurs="0" name="remark"
                        type="diggs:RemarkPropertyType"/>
                    <element minOccurs="1" ref="diggs:samplingFeatureRef"/>
                    <element minOccurs="0" name="sourceType" type="diggs:sourceTypeEnumExtType">
                        <annotation>
                            <documentation>Identifies the type of source(s) used, from a controlled
                                list of terms. This property is optional, but should be instantiated
                                in the case where sourceGeometry is not used.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="sourceSpacing"
                        type="diggs:SensorSpacingPropertyType">
                        <annotation>
                            <documentation>The min, mix and/or average spacing between source
                                stations in this configuration.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="noSourceStations" type="positiveInteger">
                        <annotation>
                            <documentation>The number of source stations used in this configuration;
                                ie., the number of locations where sources originated using this
                                configuration.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="noSources" type="positiveInteger">
                        <annotation>
                            <documentation>The number of different sources (source equipment) used
                                in this configuration.</documentation>
                        </annotation>
                    </element>
                    <element name="sourceLocations" type="diggs:SourceLocationsPropertyType">
                        <annotation>
                            <documentation>Contains a SourceLocation object that assocciates
                                specific receiver instruments to their locations.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="SourceInfoArrayPropertyType">
        <sequence maxOccurs="unbounded">
            <element ref="diggs:SourceInfo">
                <annotation>
                    <documentation>Contains properties about the sources and source locations
                        associated with a single GP_Trackline or GP_ArealSurvey sampling feature in
                        this configuration. If no specific source geometry is included, information
                        about the spacing and number of receivers can be provided using the
                        sourceInterval, noSourceStations properties. If detailed information about
                        specific sources and their locations are provided, The sourceGeometry
                        property is used, If sourceGeometry is used, at least one GP_Source object
                        must exist.</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
    <element name="SourceLocations" type="diggs:SourceLocationsType">
        <annotation>
            <documentation>An object that contains properties of the source locations and
                references.</documentation>
        </annotation>
    </element>
    <complexType name="SourceLocationsPropertyType">
        <sequence maxOccurs="1" minOccurs="0">
            <element ref="diggs:SourceLocations">
                <annotation>
                    <documentation>An object that contains details about specific source devices and
                        their locations in this configuration. The object contains two properties:
                        sourceRef and sourceLocations. sourcerRef references a sincle GP_Source
                        object. If only one GP_Source object is listed, then the sourceLocations
                        property may contain any of PointLocation, MultiPointLocation or
                        RecifiedGrid geometries. If MultiPointLocation or RectifiedGrid is used,
                        then either the GP_Source identified is successively moved to all locations
                        of the geometry or the GP_Source represents a group of receivers with
                        identical properties that are installed at each location. This distinction
                        is identified using the IsGroup property of the GP_Source object. If more
                        than one GP_Source is referenced, then use of the PointLocation geometry
                        implies that all sources are located at the same point location. If
                        MultiPointLocation or RectifiedGrid geometries are used, then there must be
                        the same number of individual locations in the geometry as there are
                        GF_Source objects referenced, and the individual locations must be in
                        sourceRef order so that each receiver's location can be
                        determined.</documentation>
                </annotation>
            </element>
        </sequence>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
    </complexType>
    <complexType name="SourceLocationsType">
        <complexContent>
            <extension base="diggs:AbstractObjectType">
                <sequence>
                    <element maxOccurs="unbounded" name="sourceRef"
                        type="diggs:FeatureReferenceType">
                        <annotation>
                            <documentation>A reference to a GP_Source object's gml:ID. At least one
                                GP_Source object must exist. If multiple sourceRef properties are
                                used the sourceLocations property must contain either a
                                MultiPointLocation or RectifiedGrid object and the order of the
                                tuples must correspond with the order of the sourceRef properties
                                within the instance.</documentation>
                        </annotation>
                    </element>
                    <element name="locations" type="diggs:GP_SensorLocationsPropertyType">
                        <annotation>
                            <documentation>One of several point style geometries (PointLocation,
                                MultiPoint,RectifiedGrid) defining the location of the sources used
                                in this configuration.</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <simpleType name="platformOrientationEnumType">
        <annotation>
            <documentation>1) oblique - instrument array is aligned obliquely to the direction of
                platform travel. 2) parallel - instrument array is aligned parallel to the direction
                of platform travel. 3) perpendicular - instrument array is aligned perpendicular to
                direction of travel</documentation>
        </annotation>
        <restriction base="string">
            <enumeration value="oblique"/>
            <enumeration value="parallel"/>
            <enumeration value="perpendicular"/>
            <enumeration value="other"/>
        </restriction>
    </simpleType>
    <element name="GP_DataAcquisitionSystem"
        substitutionGroup="diggs:AbstractGP_DataAcquisitionSystem"
        type="diggs:GP_DataAcquisitionSystemType">
        <annotation>
            <documentation>A generic data acquisition system object containing properties of a data
                recorder.</documentation>
        </annotation>
    </element>
    <complexType name="GP_DataAcquisitionSystemType" abstract="false">
        <complexContent>
            <extension base="diggs:AbstractGP_DataAcquisitionSystemType"> </extension>
        </complexContent>
    </complexType>
    <element name="AbstractGP_DataAcquisitionSystem"
        type="diggs:AbstractGP_DataAcquisitionSystemType" abstract="true">
        <annotation>
            <documentation>The head of a substitution group for data acquisition
                equipment.</documentation>
        </annotation>
    </element>
    <complexType name="AbstractGP_DataAcquisitionSystemType" abstract="true">
        <complexContent>
            <extension base="diggs:AbstractEquipmentType">
                <sequence>
                    <element minOccurs="0" name="numberChannels" type="positiveInteger">
                        <annotation>
                            <documentation>The number of recording channels</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="ReceiverEquipmentPropertyType">
        <sequence maxOccurs="1">
            <element ref="diggs:AbstractGP_Receiver">
                <annotation>
                    <documentation>The head of a substitution group for receiver
                        equipment.</documentation>
                </annotation>
            </element>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <complexType name="SourceEquipmentPropertyType">
        <sequence maxOccurs="1">
            <element ref="diggs:AbstractGP_Source">
                <annotation>
                    <documentation>The head of a substitution group for source
                        equipment.</documentation>
                </annotation>
            </element>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <complexType name="DataAcquisitionSystemPropertyType">
        <sequence maxOccurs="1">
            <element ref="diggs:AbstractGP_DataAcquisitionSystem"/>
        </sequence>
        <attributeGroup ref="gml:AssociationAttributeGroup"/>
        <attributeGroup ref="gml:OwnershipAttributeGroup"/>
    </complexType>
    <element name="PlatformMovement" type="diggs:PlatformMovementType"/>
    <complexType name="PlatformMovementType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">

                <sequence>
                    <element maxOccurs="1" minOccurs="1" ref="diggs:samplingFeatureRef">
                        <annotation>
                            <documentation>A reference to the sampling feature upon which the platform is moving.</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="platformVelocity" type="eml:LengthPerTimeMeasure">
                        <annotation>
                            <documentation>The average speed of platform movement for the
                                survey</documentation>
                        </annotation>
                    </element>
                    <element minOccurs="0" name="samplingRate" type="eml:ReciprocalTimeMeasureExt">
                        <annotation>
                            <documentation>The average rate of data collection (samples per time
                                interval). </documentation>
                        </annotation>
                    </element>
                    <element name="locations" type="diggs:GP_SensorLocationsPropertyType"
                        minOccurs="0">
                        <annotation>
                            <documentation>One of several point style geometries (PointLocation,
                                MultiPoint,RectifiedGrid) defining the location of the sources used
                                in this configuration.</documentation>
                        </annotation>
                    </element>
                </sequence>

            </extension>
        </complexContent>
    </complexType>
    <complexType name="PlatformGeometryArrayPropertyType">
        <sequence maxOccurs="unbounded">
            <element ref="diggs:PlatformMovement"/>
        </sequence>
    </complexType>
    <element name="SensorSpacing" type="diggs:SensorSpacingType"/>
    <complexType name="SensorSpacingType">
        <complexContent>
            <extension base="diggs:AbstractComponentObjectBaseType">
                <sequence>
                    <element minOccurs="0" name="minSpacing" type="eml:LengthMeasure"/>
                    <element minOccurs="0" name="maxSpacing" type="eml:LengthMeasure"/>
                    <element minOccurs="0" name="avgSpacing" type="eml:LengthMeasure"/>
                </sequence>
            </extension>
        </complexContent>
    </complexType>
    <complexType name="SensorSpacingPropertyType">
        <sequence>
            <element ref="diggs:SensorSpacing"/>
        </sequence>
    </complexType>
</schema>