I notice that the wiki page on multipolygon validity, under point 6, states that the “forest with lake with forest on island” falls foul of section 184.108.40.206 (e) of the OGC Simple Features spec, which states that “The interior of every Polygon is a connected point set”.
Thus far I agree, but is this really relevant? Shouldn’t the reference point for OSM multipolygon relations be the OGC MultiPolygon object?
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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/validity-of-cascaded-polygons/102060