<!DOCTYPE rdf:RDF [
<!ENTITY xsd "http://www.w3.org/2001/XMLSchema#" >
]>
<rdf:RDF
xml:base="http://www.example.org/ISA14#"
xmlns:owl ="http://www.w3.org/2002/07/owl#"
xmlns:rdf ="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:xsd ="http://www.w3.org/2001/XMLSchema#"
xmlns:ibs ="http://www.example.org/ISA14#"
>
<owl:Ontology rdf:about="#" />
<owl:DatatypeProperty rdf:about="http://www.example.org/ISA14#wrotePhDThesis" />
<owl:Class rdf:about="http://www.example.org/ISA14#Researcher">
<rdfs:subClassOf>
<owl:Restriction>
<owl:onProperty rdf:resource="http://www.example.org/ISA14#wrotePhDThesis" />
<owl:maxCardinality rdf:datatype="&xsd;nonNegativeInteger">1
</owl:maxCardinality>
</owl:Restriction>
</rdfs:subClassOf>
</owl:Class>
</rdf:RDF>