OWL2/tests/test11.rdf

<rdf:RDF
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:owl="http://www.w3.org/2002/07/owl#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
    xmlns:ex="http://www.example.org#"
    xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
  <ex:x rdf:about="http://www.example.org#z"/>
  <rdf:Description rdf:about="http://www.example.org#c">
    <owl:unionOf rdf:parseType="Collection">
      <rdf:Description rdf:about="http://www.example.org#x"/>
      <rdf:Description rdf:about="http://www.example.org#y"/>
    </owl:unionOf>
  </rdf:Description>
</rdf:RDF>