[postgis-users] are there any network data modul in PostGIS like oracle spatial 11g/10g ?

[sunpeng]

hi, friends,
   I've noticed in oracle 11g/10g, they support network data model, which
you could find here:Spatial Topology and Network Data Models Developer's
Guide:http://download.oracle.com/docs/cd/E11882_01/appdev.112/e11831/toc.htm.

   I wondered are there any related part in PostGIS or 3rh part open source
project?
   Thanks!
peng
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