<rdf:RDF
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:ex="http://example.org/ns/">

  <!-- cannot have both a nodeElement content and property attributes -->

   <rdf:Description>
     <ex:pred rdf:value="bar"><rdf:Description/></ex:pred>
   </rdf:Description>
</rdf:RDF>
