Graph markup

I'm looking for any information regarding current formats for describing
(node & arc) graphs.

I'm after a format to use for a graph visualisation project, but the most
promising candidates I've found have significant flaws and/or appear to be
inactive projects. I'd be interested to hear what formats people are using
in this domain.

What I've come across so far are :

XGMML - contains masses of detail relating to how the graph should be
visually represented (e.g. Graphic object attribute
stipple - The name of the stipple (pattern) to be used for the graphic
object). Perhaps a case here for XGMML-Reduced, pull out everything that SVG
covers?

RGML - this would be nice, only there doesn't appear to be much of a
mechanism (beyond core RDF) for associating resources to graph elements -
notably rgml:label is a Literal, how might one label a node with something
richer?

GXL - seems inactive.

Cheers,
Danny.


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Danny Ayers
<stuff> http://www.isacat.net </stuff>