schema visualization tools

Hi team,

Is anybody aware of a tool which can ingest an RDF schema and let you
visualize class and property hierarchies?

I've seen a number of tools, including ones built into Protege, that claim
to do this, but I had trouble getting some to work, whereas there seemed to
be licensing problems with others. If anyone can recommend a tool they have
used I'd be interested?

I'm also interested in XML Schema visualisation tools, because it would be
useful to run the Artstor XML Schema through such a tool and compare it to
the RDF Schemas we have created?

kind regards

Dr Mark H. Butler
Research Scientist                HP Labs Bristol
mark-h_butler@hp.com
Internet: http://www-uk.hpl.hp.com/people/marbut/