[mapserver-users] Displaying overlapping linestrings

[Jan Hartmann]

Does anyone know a trick to do this:

I'm making geographical indexes for the map series in our map library. 
Each map sheets is displayed as a polygonal linestring, based on its 
corner coordinates. Lots of sheets have exactly the same boundaries, so 
it's not clear where a polygon indicates just one map sheet of several. 
It's easy, of course, to write a PostGIS query to return a different 
color code when map boundaries exactly coincide, but I was wondering 
whether something like that could be done by mapserver on its own, like 
XOR-ing a line with what is already there. Any ideas?

Jan
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