Is it possible to draw Petri Net (bipartite graph) with d3?

[drozzy]

Looking for a library to help me with Petri-Net like graphs (with "start" node, and "end" node).
Here is an example:
http://en.wikipedia.org/wiki/File:Detailed_petri_net.png

Is it possible to do this in d3? And if so, how would I go about it?

I tried looking through examples, but didn't see any examples of "fixed" nodes (maybe I missed it?).

Thank you very much,

[mimicimim]

I am also working with d3 to draw bpmn network graphs but didn't find a example of similar case. I am thinking of modify d3.layout.tree to support such network. Has anyone tried this way? Is it possible to do that? Or, is there any other better solution? Thanks.

[mbostock]

Duplicate of #349.