<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:owl="http://www.w3.org/2002/07/owl#"
<owl:Ontology/>
<owl:Class rdf:ID="c">
<rdfs:subClassOf>
<owl:Restriction>
<owl:onProperty rdf:resource="#p"/>
<owl:cardinality
rdf:datatype="http://www.w3.org/2001/XMLSchema#nonNegativeInteger"
>1</owl:cardinality>
</owl:Restriction>
</rdfs:subClassOf>
</owl:Class>
<owl:ObjectProperty rdf:ID="p"/>
</rdf:RDF>