Skip all default namespaces added by rdflib.
Skip all default namespaces added by rdflib.

This is a bit of a kludge in that a prefix that matches default[0-9]*
actually defined in the data file will not show up, but that's a pretty
silly prefix name...


git-svn-id: 45f8343ee62be86ea17baff06b71d94449473551@416 42d9e433-49c6-42e3-a640-d7261620a082

harryhaaren/lv2,harryhaaren/lv2,harryhaaren/lv2