I've just spent a bunch of time on wilbur-rdf that I could have used for doing something more useful, and have nothing to show for it.
The key problem is NOKOS, or the Nokia Open Source License. This license is based on the Mozilla 1.1 license. A full reading of the license shows that if the software is covered by a patent, and the software is modified, then the patent must be re-licensed. (See here for the discussion on Debian Legal mailing list.) Unfortunately there is a patent covering wilbur-rdf. So this software is unusable in the manner I was hoping: componentize it, and apply it towards building a semantic wiki.
I'll have to start over from scratch: put together a triple store API, then build a triple store capable of dealing with OWL. Parsing OWL, RDF etc. will have to take a back seat for now.