A few weeks ago I posted some suggestions for an improved java RDF API.
I've placed an implementation of these ideas at
http://www-uk.hpl.hp.com/people/bwm/rdf/jena/index.htm
<http://www-uk.hpl.hp.com/people/bwm/rdf/jena/index.htm> .
 
The code supports in memory models.  David Megginson's RDFFilter is hooked
in so it can parse RDF serializations.  I suggest you use the version of
RDFFilter supplied in the distribution as it has some minor bug fixes.  Its
alpha code - it gets through the regression tests and runs the samples but
hasn't had much use other than that.  An SQL implementation may follow.
 
I think better tools will help encourage the adoption of RDF.  I'm looking
on this as an experiment to see whether this API brings any benefits.  So
I'd like some feedback.
 
Brian McBride
HPLabs