No way to run an external GraphViz process in an AppEngine hosted app. Right?
GraphViz does rock, however. And, you are right: it is very handy for visualizing RDF data (self plug: I had examples for this in my last Ruby book)
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He mentions a convoluted design and calling out to Dot here, so yes, it's GraphViz doing the rendering:
Well, there's always Canviz: http://code.google.com/p/canviz/
I second that thanks - looks very useful.
Hey, this is REALLY neat! Thank you.