WIP: added nested function (fixes #2)

nested/data.csv

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+ID,otherID,name
+1,ben,Ben
+2,ben,NotBen
+3,pieter,Pieter
+4,pieter,NotPieter

nested/data2.csv

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+ID,name,friendID,friendName
+batman,Batman,ben,Ben
+super,Superman,pieter,Pieter

nested/mapping.rml.ttl

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+@prefix rr: <http://www.w3.org/ns/r2rml#> .
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix fnml: <http://semweb.mmlab.be/ns/fnml#> .
+@prefix fno: <https://w3id.org/function/ontology#> .
+@prefix d2rq: <http://www.wiwiss.fu-berlin.de/suhl/bizer/D2RQ/0.1#> .
+@prefix void: <http://rdfs.org/ns/void#> .
+@prefix dc: <http://purl.org/dc/terms/> .
+@prefix foaf: <http://xmlns.com/foaf/0.1/> .
+@prefix rml: <http://semweb.mmlab.be/ns/rml#> .
+@prefix ql: <http://semweb.mmlab.be/ns/ql#> .
+@prefix : <http://mapping.example.com/> .
+@prefix ex: <http://example.com#> .
+@prefix grel: <http://users.ugent.be/~bjdmeest/function/grel.ttl#> .
+@prefix idlab-fn: <http://example.com/idlab/function/> .
+
+:rules_000 rdf:type void:Dataset ;
+	void:exampleResource :map_myMapping_000, :map_myOtherMapping_000 .
+
+:map_myMapping_000 rml:logicalSource :source_000 ;
+	rdf:type rr:TriplesMap ;
+	rdfs:label "myMapping" ;
+	rr:subjectMap :s_000 ;
+	rr:predicateObjectMap :pom_000, :pom_001, :pom_002 .
+
+:source_000 rdf:type rml:LogicalSource ;
+	rml:source "data.csv" ;
+	rml:referenceFormulation ql:CSV .
+
+:s_000 rdf:type rr:SubjectMap ;
+	rr:template "http://example.com#{ID}" .
+
+:pom_000 rdf:type rr:PredicateObjectMap ;
+	rr:predicateMap :pm_000 ;
+	rr:objectMap :om_000 .
+
+:pm_000 rdf:type rr:PredicateMap ;
+	rr:constant rdf:type .
+
+:om_000 rdf:type rr:ObjectMap ;
+	rr:constant "http://example.com#Person" ;
+	rr:termType rr:IRI .
+
+:pom_001 rdf:type rr:PredicateObjectMap ;
+	rr:predicateMap :pm_001 ;
+	rr:objectMap :om_001 .
+
+:pm_001 rdf:type rr:PredicateMap ;
+	rr:constant ex:label .
+
+:om_001 rdf:type rr:ObjectMap ;
+	rml:reference "name" ;
+	rr:termType rr:Literal .
+
+:pom_002 rdf:type rr:PredicateObjectMap ;
+	rr:predicateMap :pm_002 ;
+	rr:objectMap :om_002 .
+
+:pm_002 rdf:type rr:PredicateMap ;
+	rr:constant ex:isFriendsWith .
+
+:map_myOtherMapping_000 rml:logicalSource :source_001 ;
+	rdf:type rr:TriplesMap ;
+	rdfs:label "myOtherMapping" ;
+	rr:subjectMap :s_001 ;
+	rr:predicateObjectMap :pom_003 .
+
+:source_001 rdf:type rml:LogicalSource ;
+	rml:source "data2.csv" ;
+	rml:referenceFormulation ql:CSV .
+
+:s_001 rdf:type rr:SubjectMap ;
+	rr:template "http://example.com#heroes_{ID}" .
+
+:pom_003 rdf:type rr:PredicateObjectMap ;
+	rr:predicateMap :pm_003 ;
+	rr:objectMap :om_003 .
+
+:pm_003 rdf:type rr:PredicateMap ;
+	rr:constant rdf:type .
+
+:om_003 rdf:type rr:ObjectMap ;
+	rr:constant "http://example.com#Hero" ;
+	rr:termType rr:IRI .
+
+:om_002 rdf:type rr:ObjectMap ;
+	rr:parentTriplesMap :map_myOtherMapping_000 ;
+	rml:joinCondition :jc_000 .
+
+:jc_000 rdf:type fnml:FunctionTermMap ;
+	fnml:functionValue :fn_000 .
+
+:fn_000 rr:predicateObjectMap :pomexec_000, :pom_004, :pom_007 .
+
+:pomexec_000 rr:predicateMap :pmexec_000 ;
+	rr:objectMap :omexec_000 .
+
+:pmexec_000 rr:constant fno:executes .
+
+:omexec_000 rr:constant "http://users.ugent.be/~bjdmeest/function/grel.ttl#boolean_and" ;
+	rr:termType rr:IRI .
+
+:pom_004 rdf:type rr:PredicateObjectMap ;
+	rr:predicateMap :pm_004 ;
+	rr:objectMap :om_004 .
+
+:pm_004 rdf:type rr:PredicateMap ;
+	rr:constant grel:param_rep_b .
+
+:om_004 rdf:type rr:ObjectMap, fnml:FunctionTermMap ;
+	fnml:functionValue :fn_001 .
+
+:fn_001 rr:predicateObjectMap :pomexec_001, :pom_005, :pom_006 .
+
+:pomexec_001 rr:predicateMap :pmexec_001 ;
+	rr:objectMap :omexec_001 .
+
+:pmexec_001 rr:constant fno:executes .
+
+:omexec_001 rr:constant "http://example.com/idlab/function/equal" ;
+	rr:termType rr:IRI .
+
+:pom_005 rdf:type rr:PredicateObjectMap ;
+	rr:predicateMap :pm_005 ;
+	rr:objectMap :om_005 .
+
+:pm_005 rdf:type rr:PredicateMap ;
+	rr:constant grel:valueParameter .
+
+:om_005 rdf:type rr:ObjectMap ;
+	rml:reference "otherID" ;
+	rr:termType rr:Literal .
+
+:pom_006 rdf:type rr:PredicateObjectMap ;
+	rr:predicateMap :pm_006 ;
+	rr:objectMap :om_006 .
+
+:pm_006 rdf:type rr:PredicateMap ;
+	rr:constant grel:valueParameter2 .
+
+:om_006 rdf:type rr:ObjectMap ;
+	rml:parentTermMap :ptm_000 .
+
+:ptm_000 rml:reference "friendID" .
+
+:pom_007 rdf:type rr:PredicateObjectMap ;
+	rr:predicateMap :pm_007 ;
+	rr:objectMap :om_007 .
+
+:pm_007 rdf:type rr:PredicateMap ;
+	rr:constant grel:param_rep_b .
+
+:om_007 rdf:type rr:ObjectMap, fnml:FunctionTermMap ;
+	fnml:functionValue :fn_002 .
+
+:fn_002 rr:predicateObjectMap :pomexec_002, :pom_008, :pom_009 .
+
+:pomexec_002 rr:predicateMap :pmexec_002 ;
+	rr:objectMap :omexec_002 .
+
+:pmexec_002 rr:constant fno:executes .
+
+:omexec_002 rr:constant "http://example.com/idlab/function/equal" ;
+	rr:termType rr:IRI .
+
+:pom_008 rdf:type rr:PredicateObjectMap ;
+	rr:predicateMap :pm_008 ;
+	rr:objectMap :om_008 .
+
+:pm_008 rdf:type rr:PredicateMap ;
+	rr:constant grel:valueParameter .
+
+:om_008 rdf:type rr:ObjectMap ;
+	rml:reference "name" ;
+	rr:termType rr:Literal .
+
+:pom_009 rdf:type rr:PredicateObjectMap ;
+	rr:predicateMap :pm_009 ;
+	rr:objectMap :om_009 .
+
+:pm_009 rdf:type rr:PredicateMap ;
+	rr:constant grel:valueParameter2 .
+
+:om_009 rdf:type rr:ObjectMap ;
+	rml:parentTermMap :ptm_001 .
+
+:ptm_001 rml:reference "friendName" .
+

nested/mapping.yml

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+prefixes:
+  ex: http://example.com#
+  grel: http://users.ugent.be/~bjdmeest/function/grel.ttl#
+  idlab-fn: "http://example.com/idlab/function/"
+
+mappings:
+  myMapping:
+    sources:
+      - ["data.csv~csv"]
+    s: ex:$(ID)
+    po:
+      - [a, ex:Person]
+      - [ex:label, $(name)]
+      - p: ex:isFriendsWith
+        o:
+          - mapping: myOtherMapping
+            condition:
+              function: grel:boolean_and
+              parameters:
+                - parameter: grel:param_rep_b
+                  value:
+                    function: idlab-fn:equal
+                    parameters:
+                      - [grel:valueParameter, "$(otherID)", s]
+                      - [grel:valueParameter2, "$(friendID)", o]
+                - parameter: grel:param_rep_b
+                  value:
+                    function: idlab-fn:equal
+                    parameters:
+                      - [grel:valueParameter, "$(name)", s]
+                      - [grel:valueParameter2, "$(friendName)", o]
+  myOtherMapping:
+    sources:
+      - ["data2.csv~csv"]
+    s: http://example.com#heroes_$(ID)
+    po:
+      - [a, ex:Hero]

nested/output.ttl

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+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
+@prefix ex: <http://example.com#>.
+@prefix grel: <http://users.ugent.be/~bjdmeest/function/grel.ttl#>.
+@prefix idlab-fn: <http://example.com/idlab/function/>.
+
+<http://example.com#1> a ex:Person;
+    ex:label "Ben";
+    ex:isFriendsWith ex:heroes_batman.
+<http://example.com#2> a ex:Person;
+    ex:label "NotBen".
+<http://example.com#3> a ex:Person;
+    ex:label "Pieter";
+    ex:isFriendsWith ex:heroes_super.
+<http://example.com#4> a ex:Person;
+    ex:label "NotPieter".
+ex:heroes_batman a ex:Hero;
+    ex:label "Batman".
+ex:heroes_super a ex:Hero;
+    ex:label "Superman".