The GEOS project is porting the Java Topology Suite (JTS) to a C++ library, 
which will then be used to provide more advanced topology operations to 
PostGIS. This functionality should be available sometime later this year.

http://geos.refractions.net/

Chris

Quoting Steffen Koehler <skoehler@buschjena.de>:

> Hello,
> 
> in the postgis installation I have found functions for testing intersection
> only.
> Is there an library with functions to do some intersections where the
> result is an geometry object not an boolean value?
> Is there an project for implementing the OGC Simple Feature Specification
> for SQL for postgis?
> 
> thanks Steffen
> 
> 
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