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<font face="Times New Roman, Times, serif">Does anyone know a trick
to do this:<br>
<br>
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?<br>
<br>
Jan <br>
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