Dave, it took me a day to wrap my head around GraphML and I 
    am now able to transform my XML to a GraphML representation 
    of the data. I downloaded the graphviz Windows binary and 
    the dot User's Manual. After about an hour of fiddling, I 
    was able to transform my GraphML to a dot program and using 
    dot, I produced an SVG file. This is, pardon my parochial 
    term, out-freakin'-standing! 
    

I must agree. I really don't know how they've done it, its the
sort of output Xerox Park were famous for.

I gather it can be coerced into following more detailed layout
requirements, and as with most graphical output, that does
take skill, but for most basic node-arc class of diagrams
it really is straightforward, and as with most classy software
its easy to do easy things, and capable of doing harder ones.

I'm curious why it gets so little publicity.

<advert> http://www.research.att.com/sw/tools/graphviz/</advert>

regards DaveP

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