Marco,
I suspect this is because you are expecting linear rings to "contains"
the area they enclose. But this is not how linear rings are defined -
they are 1-dimensional features, not areal ones. A linear ring would
only be "within" another one if its linework lay exactly on top of the
other one's linework. GEOS is behaving correctly, according to the SFS
geometry model.
--
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022
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