Definiere Namespace-Präfix org:

public/vocab/emblem/rdk.rdf

 <rdf:RDF xmlns:dct="http://purl.org/dc/terms/"
-         xmlns:owl="http://www.w3.org/2002/07/owl#"
+         xmlns:org="http://www.w3.org/ns/org#"
          xmlns:skos="http://www.w3.org/2004/02/skos/core#"
          xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
   <skos:ConceptScheme rdf:about="http://uri.hab.de/vocab/emblem/rdk">