[postgis-users] Polygons Intersection -> LineStrings

[Arnaud Lesauvage]

strk at refractions.net a écrit :
> B is contains "touching holes", resulting valid (is it a IsValid bug?).

This is not a IsValid bug as per OpenGIS specifications :
"No two rings in the boundary cross, the rings in the boundary of 
a Polygon may intersect at a Point but only as a tangent."
We are in the "tangent" case here, where only one point is common 
to the two boundaries.

--
Arnaud