Iterable<Statement> graph = serializer.serialize( entityDescriptor );
String[] prefixes = new String[]{ "rdf", "dc", " vc", "qi4j" };
String[] namespaces = new String[]{ Rdfs.RDF, DcRdf.NAMESPACE, "http://www.w3.org/2001/vcard-rdf/3.0#", Qi4jEntityType.NAMESPACE };
new RdfXmlSerializer().serialize( graph, new PrintWriter( System.out ), prefixes, namespaces );
}