Draw And-Or tree - need to draw arcs between/across edges

Hi all,

Not sure if this problem was asked before...

I have problems in drawing and-or trees using Graphviz. I need to draw arc between/across edges, e.g.
http://en.wikipedia.org/wiki/File:Andortree.png
I need to draw the arc like the one between (P,Q) and (P,R)

How can I draw such arc? Is it possible to use the custom cluster?

There is no way specify or do

There is no way specify or do this with the current features. You could post-process your graph and add the arcs as part of the drawings of one of the edges or as part of the background.

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