On Sat, Jan 19, 2013 at 01:00:08AM -0800, GerdP wrote:
>I don't know yet how multiple nested polygons look like, but I think it
>is a promising approach.
It should be simple. A line is both an inner member of the outer
multipolygon, and the outer member of an inner multipolygon. So,
basically you have two non-intersecting and non-overlapping
multipolygons.
There are some lakes with islands with lakes in Finland. One is
Partalansaari, if I remember correctly. You could also have small
patches of forest in the middle of a field in the middle of a forest, or
vice versa.
Marko
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