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java.lang.StackOverflowError when running custom compiled RMLStreamer #19

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mielvds opened this issue Jul 1, 2020 · 0 comments
Closed

java.lang.StackOverflowError when running custom compiled RMLStreamer #19

mielvds opened this issue Jul 1, 2020 · 0 comments

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@mielvds
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mielvds commented Jul 1, 2020

When running flink run -c io.rml.framework.Main /Users/mielvandersande/Tools/RMLStreamer/target/RMLStreamer-2.0.0-RELEASE.jar toFile --mapping-file ./mapping-rml.ttl --output-path ./data.ttl ./mapping-rml.ttl (not using docker), I get a stack overflow.

The headers of my csv are:

fragment_id_mam,mediaobject_id_mam,cp,cp_id,sp_id,sp_name,pid,dc_description,dc_format,dc_publisher,dc_source,dc_terms,dc_title,dcterms_abstract,dcterms_created,dcterms_issued

The mapping file is:

@prefix map: <#>.
@prefix rml: <http://semweb.mmlab.be/ns/rml#> .
 @prefix ql: <http://semweb.mmlab.be/ns/ql#> .
@prefix rr: <http://www.w3.org/ns/r2rml#> .
@prefix vcard: <http://www.w3.org/2001/vcard-rdf/3.0#> . 
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . 
@prefix skos: <http://www.w3.org/2004/02/skos/core#> . 
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix conf: <http://ufc.br/rdb2rdfmb/conf/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . 
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

@prefix edtf: <http://id.loc.gov/datatypes/edtf> .
@prefix meemoo: <http://data.meemoo.be/ns/> .

map:FragmentMetadata rml:source "./head.csv";
    rml:referenceFormulation ql:CSV.

map:Fragment
    rml:logicalSource  map:FragmentMetadata;
    rr:subjectMap [
        rr:template "http://data.meemoo.be/fm/{fragment_id_mam}";
        rr:class meemoo:Fragment;
    ];
    rr:predicateObjectMap [
        rr:predicate meemoo:hasContentpartner;
        rr:objectMap [ rr:parentTriplesMap map:Contentpartner ];
    ];
    rr:predicateObjectMap [
        rr:predicate meemoo:hasServiceprovider;
        rr:objectMap [ rr:parentTriplesMap map:Serviceprovider ];
    ];
    rr:predicateObjectMap [
        rr:predicate dcterms:isPartOf;
        rr:objectMap [ rr:parentTriplesMap map:MediaObject ];
    ].

map:MediaObject
    rml:logicalSource map:FragmentMetadata;
    rr:subjectMap [
        rr:template "http://data.meemoo.be/mo/{mediaobject_id_mam}";
        rr:class meemoo:MediaObject;
    ];
    rr:predicateObjectMap [
        rr:predicate dcterms:hasPart;
        rr:objectMap [ rr:parentTriplesMap map:Fragment ];
    ].

map:Contentpartner
    rml:logicalSource map:FragmentMetadata;
    rr:subjectMap [
        rr:template "http://data.meemoo.be/cp/{CP_id}";
        rr:class meemoo:Contentpartner;
    ];
    rr:predicateObjectMap [
        rr:predicate rdfs:label;
        rr:objectMap [ rr:column "CP" ];
    ];
    rr:predicateObjectMap [
        rr:predicate dc:identifier;
        rr:objectMap [ rr:column "CP_id" ];
    ].


map:Serviceprovider
    rml:logicalSource map:FragmentMetadata;
    rr:subjectMap [
        rr:template "http://data.meemoo.be/sp/{sp_id}";
        rr:class meemoo:Serviceprovider;
    ];
    rr:predicateObjectMap [
        rr:predicate rdfs:label;
        rr:objectMap [ rr:column "sp_name" ];
    ];
    rr:predicateObjectMap [
        rr:predicate dc:identifier;
        rr:objectMap [ rr:column "sp_id" ];
    ].

map:IntellectualEntity
    rml:logicalSource map:FragmentMetadata;
    rr:subjectMap [
        rr:template "http://data.meemoo.be/ie/{PID}";
        rr:class meemoo:IntellectualEntity;
    ];
    rr:predicateObjectMap [
        rr:predicate dcterms:title;
        rr:objectMap [ rr:column "dc_title" ];
    ];
    rr:predicateObjectMap [
        rr:predicate dcterms:abstract;
        rr:objectMap [ rr:column "dcterms_abstract" ];
    ];
    rr:predicateObjectMap [
        rr:predicate dcterms:created;
        rr:objectMap [ rr:column "dcterms_created" ];
    ];
    rr:predicateObjectMap [
        rr:predicate dcterms:issued;
        rr:objectMap [ rr:column "dcterms_issued" ];
    ];
    rr:predicateObjectMap [
        rr:predicate dcterms:description;
        rr:objectMap [ rr:column "dc_description" ];
    ];
    rr:predicateObjectMap [
        rr:predicate dcterms:publisher;
        rr:objectMap [ rr:column "dc_publisher" ];
    ];
    rr:predicateObjectMap [
        rr:predicate dcterms:source;
        rr:objectMap [ rr:column "dc_source" ];
    ];
    rr:predicateObjectMap [
        rr:predicate dcterms:date;
        rr:objectMap [ rr:column "dc_terms"; rr:datatype edtf:EDTF ];
    ].


java.lang.StackOverflowError
        at java.util.concurrent.atomic.AtomicReferenceArray.get(AtomicReferenceArray.java:125)
        at org.apache.jena.ext.com.google.common.cache.LocalCache$Segment.getFirst(LocalCache.java:2657)
        at org.apache.jena.ext.com.google.common.cache.LocalCache$Segment.getEntry(LocalCache.java:2664)
        at org.apache.jena.ext.com.google.common.cache.LocalCache$Segment.getLiveEntry(LocalCache.java:2685)
        at org.apache.jena.ext.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2065)
        at org.apache.jena.ext.com.google.common.cache.LocalCache.getIfPresent(LocalCache.java:3949)
        at org.apache.jena.ext.com.google.common.cache.LocalCache$LocalManualCache.getIfPresent(LocalCache.java:4859)
        at org.apache.jena.atlas.lib.cache.CacheGuava.getIfPresent(CacheGuava.java:68)
        at org.apache.jena.enhanced.EnhGraph.getNodeAs(EnhGraph.java:118)
        at org.apache.jena.rdf.model.impl.IteratorFactory.asResource(IteratorFactory.java:71)
        at org.apache.jena.rdf.model.impl.IteratorFactory.asProperty(IteratorFactory.java:65)
        at org.apache.jena.rdf.model.impl.ModelCom.getProperty(ModelCom.java:933)
        at org.apache.jena.rdf.model.impl.ModelCom.createProperty(ModelCom.java:1432)
        at io.rml.framework.core.model.rdf.jena.JenaResource.listProperties(JenaResource.scala:49)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjects(StdObjectMapExtractor.scala:54)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:59)
        at scala.collection.immutable.List.map(List.scala:282)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:59)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.extract(StdPredicateObjectMapExtractor.scala:38)
        at io.rml.framework.core.extractors.std.StdTriplesMapExtractor.extractTriplesMapProperties(StdTriplesMapExtractor.scala:95)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractParentTriplesMap(StdObjectMapExtractor.scala:181)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.io$rml$framework$core$extractors$std$StdObjectMapExtractor$$extractObjectMap(StdObjectMapExtractor.scala:101)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:81)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor$$anonfun$extractObjectMaps$1.apply(StdObjectMapExtractor.scala:76)
        at scala.collection.immutable.List.flatMap(List.scala:334)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extractObjectMaps(StdObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:43)
        at io.rml.framework.core.extractors.std.StdObjectMapExtractor.extract(StdObjectMapExtractor.scala:35)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor.io$rml$framework$core$extractors$std$StdPredicateObjectMapExtractor$$extractPredicateObjectMap(StdPredicateObjectMapExtractor.scala:76)
        at io.rml.framework.core.extractors.std.StdPredicateObjectMapExtractor$$anonfun$extract$1.apply(StdPredicateObjectMapExtractor.scala:64)
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