Hi William,
pygraphviz is a module to export some kinds of diagram...

for example:

from a group of polygons (archaeological layers in my case) stored in
postgres and
linked to a table that defines the sequence  1 after 2, 2 after 3, 3 before
4 and
.....  pygraphviz returns as a graph this sequence:

https://picasaweb.google.com/mandoluca/Pygraphviz02?authkey=Gv1sRgCPCWgYvcx_Xy0wE#5577382203073709298
<http://pygraphviz sequence exported from pyarchinit plugin>

pygraphviz is binded to graphviz through a .so file

<http://pygraphviz sequence exported from pyarchinit plugin>
http://networkx.lanl.gov/pygraphviz/

http://www.graphviz.org/

graphviz can be usefull also for demographic or geological studies, etc.

thanks a lot and best regards

Luca
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