Using RDF statements as body in Web Annotation Data Model?

I am trying to use Web Annotation Data Model (WADM) in order to add provenance information on RDF statements.

To clarify things, each RDF statement (typical subject-predicate-object triples) in my ontology has been created based on knowledge provided on a specific free-text snippet. I want to create a WADM Annotation on each RDF statement, having the RDF statement itself as a Body and pointing to the respective free-text snippet as a Target.

Pointing to the free-text snippet as a target is clear to me using Text Quote Selectors. However, I cannot seem to find an example of annotating a free-text code with RDF statements per se.

Can anybody point me to an example on how could this be done with Protege?

Solution

I think I found a workaround by annotating the statements (e.g. an ObjectPropertyAssertion) with an annotation using "hasTarget" as the annotation property.

For example, if I want to use the RDF statement <Subject, Property, Object> to annotate a target pdf located somewhere in the internet, I would use the following rationale:

<ObjectPropertyAssertion>
        <Annotation>
            <AnnotationProperty IRI="http://www.w3.org/ns/oa#hasTarget"/>
            <AnonymousIndividual nodeID="_:genid-f7b71d4c-657e-40bc-bc69-31fc3af8b603"/>
        </Annotation>
        <ObjectProperty IRI="<Predicate>"/>
        <NamedIndividual IRI="<Subject>"/>
        <NamedIndividual IRI="<Object>"/>
</ObjectPropertyAssertion>

<AnnotationAssertion>
    <AnnotationProperty IRI="http://www.w3.org/ns/oa#hasSource"/>
    <AnonymousIndividual nodeID="_:genid-0d456ba2-52b9-470d-ad70-efafbc06d261"/>
    <Literal datatypeIRI="http://www.w3.org/2001/XMLSchema#anyURI">source_url</Literal>
</AnnotationAssertion>

<ObjectPropertyAssertion>
        <ObjectProperty IRI="http://www.w3.org/ns/oa#hasSelector"/>
        <AnonymousIndividual nodeID="_:genid-f7b71d4c-657e-40bc-bc69-31fc3af8b603"/>
        <NamedIndividual IRI="#selector_1"/>
</ObjectPropertyAssertion>

<ClassAssertion>
        <Class IRI="http://www.w3.org/ns/oa#TextQuoteSelector"/>
        <NamedIndividual IRI="#selector_1"/>
</ClassAssertion>

<DataPropertyAssertion>
        <DataProperty IRI="http://www.w3.org/ns/oa#exact"/>
        <NamedIndividual IRI="#selector_1"/>
        <Literal datatypeIRI="http://www.w3.org/1999/02/22-rdf-syntax-ns#PlainLiteral">some text</Literal>
</DataPropertyAssertion>

 <DataPropertyAssertion>
        <DataProperty IRI="http://www.w3.org/ns/oa#prefix"/>
        <NamedIndividual IRI="#selector_1"/>
        <Literal datatypeIRI="http://www.w3.org/1999/02/22-rdf-syntax-ns#PlainLiteral">some prefix</Literal>
</DataPropertyAssertion>

<DataPropertyAssertion>
        <DataProperty IRI="http://www.w3.org/ns/oa#suffix"/>
        <NamedIndividual IRI="#selector_1"/>
        <Literal datatypeIRI="http://www.w3.org/1999/02/22-rdf-syntax-ns#PlainLiteral">some suffix</Literal>
</DataPropertyAssertion>

It can be done in protege by annotating a statement using the "@" symbol on the right of each property assertion (namely the original <Subject, Property, Object> statement), in the "Property assertions" view.

I am not really sure that it is fully compliant but it seems Ok to me.

Hope it is helpful for others too.

Edit: Full version of an example ontology, as requested, directly produced by protege in OWL/XML format.

<?xml version="1.0"?>
<Ontology xmlns="http://www.w3.org/2002/07/owl#"
     xml:base="http://www.semanticweb.org/example"
     xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
     xmlns:xml="http://www.w3.org/XML/1998/namespace"
     xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
     xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
     ontologyIRI="http://www.semanticweb.org/example">
    <Prefix name="" IRI="http://www.semanticweb.org/example"/>
    <Prefix name="owl" IRI="http://www.w3.org/2002/07/owl#"/>
    <Prefix name="rdf" IRI="http://www.w3.org/1999/02/22-rdf-syntax-ns#"/>
    <Prefix name="xml" IRI="http://www.w3.org/XML/1998/namespace"/>
    <Prefix name="xsd" IRI="http://www.w3.org/2001/XMLSchema#"/>
    <Prefix name="rdfs" IRI="http://www.w3.org/2000/01/rdf-schema#"/>
    <Import>http://www.w3.org/ns/oa#</Import>
    <Declaration>
        <AnnotationProperty IRI="http://www.w3.org/ns/oa#hasSource"/>
    </Declaration>
    <Declaration>
        <ObjectProperty IRI="http://www.w3.org/ns/oa#hasSelector"/>
    </Declaration>
    <Declaration>
        <NamedIndividual IRI="#exampleIndividual2"/>
    </Declaration>
    <Declaration>
        <DataProperty IRI="http://www.w3.org/ns/oa#prefix"/>
    </Declaration>
    <Declaration>
        <AnnotationProperty IRI="http://www.w3.org/ns/oa#hasTarget"/>
    </Declaration>
    <Declaration>
        <DataProperty IRI="http://www.w3.org/ns/oa#suffix"/>
    </Declaration>
    <Declaration>
        <NamedIndividual IRI="#exampleIndividual"/>
    </Declaration>
    <Declaration>
        <NamedIndividual IRI="#selector_1"/>
    </Declaration>
    <Declaration>
        <DataProperty IRI="http://www.w3.org/ns/oa#exact"/>
    </Declaration>
    <Declaration>
        <ObjectProperty IRI="#exampleProperty"/>
    </Declaration>
    <ClassAssertion>
        <Class IRI="http://www.w3.org/ns/oa#TextQuoteSelector"/>
        <NamedIndividual IRI="#selector_1"/>
    </ClassAssertion>
    <ObjectPropertyAssertion>
        <Annotation>
            <AnnotationProperty IRI="http://www.w3.org/ns/oa#hasTarget"/>
            <AnonymousIndividual nodeID="_:genid36"/>
        </Annotation>
        <ObjectProperty IRI="#exampleProperty"/>
        <NamedIndividual IRI="#exampleIndividual2"/>
        <NamedIndividual IRI="#exampleIndividual"/>
    </ObjectPropertyAssertion>
    <ObjectPropertyAssertion>
        <ObjectProperty IRI="http://www.w3.org/ns/oa#hasSelector"/>
        <AnonymousIndividual nodeID="_:genid36"/>
        <NamedIndividual IRI="#selector_1"/>
    </ObjectPropertyAssertion>
    <DataPropertyAssertion>
        <DataProperty IRI="http://www.w3.org/ns/oa#exact"/>
        <NamedIndividual IRI="#selector_1"/>
        <Literal datatypeIRI="http://www.w3.org/1999/02/22-rdf-syntax-ns#PlainLiteral">some text</Literal>
    </DataPropertyAssertion>
    <DataPropertyAssertion>
        <DataProperty IRI="http://www.w3.org/ns/oa#prefix"/>
        <NamedIndividual IRI="#selector_1"/>
        <Literal datatypeIRI="http://www.w3.org/1999/02/22-rdf-syntax-ns#PlainLiteral">some prefix</Literal>
    </DataPropertyAssertion>
    <DataPropertyAssertion>
        <DataProperty IRI="http://www.w3.org/ns/oa#suffix"/>
        <NamedIndividual IRI="#selector_1"/>
        <Literal datatypeIRI="http://www.w3.org/1999/02/22-rdf-syntax-ns#PlainLiteral">some suffix</Literal>
    </DataPropertyAssertion>
    <AnnotationAssertion>
        <AnnotationProperty IRI="http://www.w3.org/ns/oa#hasSource"/>
        <AnonymousIndividual nodeID="_:genid36"/>
        <Literal datatypeIRI="http://www.w3.org/1999/02/22-rdf-syntax-ns#PlainLiteral">source_url</Literal>
    </AnnotationAssertion>
    <AnnotationAssertion>
        <AnnotationProperty IRI="http://www.w3.org/ns/oa#hasSource"/>
        <AnonymousIndividual nodeID="_:genid37"/>
        <Literal datatypeIRI="http://www.w3.org/2001/XMLSchema#anyURI">source_url</Literal>
    </AnnotationAssertion>
</Ontology>



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