<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>