RDF needed this, and came up with graphviz and dot.
http://www.research.att.com/sw/tools/graphviz/
It does such a good job, producing well laid out svg, that doing
it any other way seems a little ott IMHO.

I wrote a couple of stylesheets to generate this, from which I produced
svg using their software. It really is straightforward,
and I found their results so much better than those I'd been producing.

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Manos Batsis

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http://www.netsmart.gr
mbatsis at netsmart dot gr
(+30) 210 33 02 608
(+30) 210 33 02 658
http://forte.netsmart.gr/foaf/manos_foaf.rdf