<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:owl="http://www.w3.org/2002/07/owl#"
   xmlns:f="foo://bla#"
   xml:base="foo://bla#">
 <owl:Class rdf:about="Person">
  <owl:disjointUnionOf rdf:parseType="Collection">
   <owl:Class rdf:about="Male"/>
   <owl:Class rdf:about="Female"/>
  </owl:disjointUnionOf>
 </owl:Class>
 <f:Male rdf:about="John"/>
 <f:Female rdf:about="Mary"/>
 <!--<f:Female rdf:about="John"/>-->
</rdf:RDF>