On Sun, Sep 22, 2013 at 4:51 AM, Peter Wendorff <wendo...@uni-paderborn.de>wrote:
> IMHO it's clear: > - a tag on a way describes that way, if it's a closed way and the tag is > describing an area, the tag matches the complete area inside that polygon. > - if a way is outer of a multipolygon and there are tags on the way, > these tags nevertheless describe the whole area, including all holes, as > it's still a tag on the (simple) polygon. > - if a way is inner of a multipolygon and there are tags on the way, > these tags describe the polygon described by this way. > - tags on the multipolygon relation describe the area represented by the > relation - that is all outer polygons minus the inner polygons. > I agree that this is a good way of tagging multipolygons. Unfortunately, many people don't tag multipolygons in this way. I've seen people add building=yes to an outer way of a building with holes even though there's a multipolygon relation with that tag already. It's most likely that these people are not familiar with relations and they see an outer way with no building=yes tag and decided to "helpfully" tag it. Because of this, a more complicated interpretation of tags, such as Frederik's, leads to less breakage (think rendering) and is more in line with people's expectations.
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