Ontology sample

@prefix :        <http://example.com/myFoaf/> .
@prefix myFoaf:  <http://example.com/myFoaf/> .
@prefix owl:     <http://www.w3.org/2002/07/owl#> .
@prefix rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs:    <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd:     <http://www.w3.org/2001/XMLSchema#> .

<http://example.com/myFoaf/>
      rdf:type owl:Ontology .

myFoaf:Agent
    rdf:type owl:Class ;
    rdfs:subClassOf
      [ rdf:type owl:Restriction ;
        owl:minCardinality "1"^^xsd:nonNegativeInteger ;
        owl:onProperty myFoaf:id
      ] ;
    rdfs:subClassOf
      [ rdf:type owl:Restriction ;
        owl:cardinality "1"^^xsd:nonNegativeInteger ;
        owl:onProperty myFoaf:email
      ] .

myFoaf:Person
    rdf:type owl:Class ;
    rdfs:subClassOf myFoaf:Agent ;
    rdfs:subClassOf
      [ rdf:type owl:Restriction ;
        owl:minCardinality "2"^^xsd:nonNegativeInteger ;
        owl:onProperty myFoaf:nick
      ] .
      
myFoaf:id
    rdf:type owl:DatatypeProperty ;
    rdfs:domain myFoaf:Agent ;
    rdfs:range xsd:string .    
    
myFoaf:nick
    rdf:type owl:DatatypeProperty ;
    rdfs:subPropertyOf myFoaf:id ;
    rdfs:domain myFoaf:Person ;
    rdfs:range xsd:string .

myFoaf:email
    rdf:type owl:DatatypeProperty ;
    rdfs:domain myFoaf:Agent ;
    rdfs:range xsd:string .