multiple classes with rr:class doesn't work

[Yocote0111]

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rr: <http://www.w3.org/ns/r2rml#>.
@prefix rml: <http://semweb.mmlab.be/ns/rml#>.
@prefix ql: <http://semweb.mmlab.be/ns/ql#>.
@base <http://example#>.

<#PersonMapping> a rr:TripleMap;
    rml:logicalSource [
        rml:source "./resources/data/json/example.json";
        rml:referenceFormulation ql:JSONPath;
        rml:iterator "$.persons[*]";
    ];
    rr:subjectMap [
        rr:template "http://example/{id}";
        rr:termType rr:IRI;
        rr:class <#Person>, <#Thing>;  # mutiple classes with rr:class
    ];
    .

and

{
    "persons": [
        {
            "id": 1
        }
    ]
}

expects

<http://example/1> a <#Person>, <#Thing>

but it returns an error as below

TypeError: Cannot read property 'predicateObjectMap' of undefined ..

[Yocote0111]

Instead of rr:class, it works with rr:predicateObjectMap [ rr:predicate rdf:type .. ]

<#PersonMapping> a rr:TripleMap;
    # ..
    rr:predicateObjectMap [
        rr:predicate rdf:type ;
        rr:termType rr:IRI;
        rr:objectMap [
            rr:constant ex:Person, ex:Thing; # multiple classes
        ]
    ]

When I try with the following,

<#PersonMapping> a rr:TripleMap;
    rr:subjectMap [
        rr:template "http://example/{id}";
        rr:termType rr:IRI;
        rr:class ex:Person;
    ];
    rr:predicateObjectMap [
        rr:predicate rdf:type ;
        rr:termType rr:IRI;
        rr:objectMap [
            rr:constant ex:Thing;
        ]
    ]
   .

it returns only ex:Thing and ignore ex:Person

<http://example/1> a ex:Thing.

[DylanVanAssche]

Hi @Yocote0111 !

Sorry for the late reply, but it seems you have a typo in your mapping rules. You need to use a rr:TriplesMap; instead of a rr:TripleMap;.

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rr: <http://www.w3.org/ns/r2rml#>.
@prefix rml: <http://semweb.mmlab.be/ns/rml#>.
@prefix ql: <http://semweb.mmlab.be/ns/ql#>.
@base <http://example#>.

<#PersonMapping> a rr:TriplesMap;
    rml:logicalSource [
        rml:source "./resources/data/json/example.json";
        rml:referenceFormulation ql:JSONPath;
        rml:iterator "$.persons[*]";
    ];
    rr:subjectMap [
        rr:template "http://example/{id}";
        rr:termType rr:IRI;
        rr:class <#Person>, <#Thing>;  # mutiple classes with rr:class
    ];
    .

I tested these rules on the current RMLMapper and they output what you expect:

[dylan@dell-laptop rmlmapper-java-6]$ java -jar target/rmlmapper-4.13.0-r360-all.jar -m mapping.rml.ttl 
<http://example/1> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://example#Person>.
<http://example/1> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://example#Thing>.

Let us know if you still have any question :)

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