Oct 30, 2020, 16:33 by talk@openstreetmap.org: > A split polygon with only an outer MP is not an "area". > It is a valid multipolygon representing an area. A bit pointless multipolygon and maybe something that should be converted to version not using relation, but it is a valid tagging. > There's a clue in the name 'MultiPolygon' there has to be more than one. > Strictly speaking it means that it CAN have more than one part. > Splitting into two serves no purpose, adds no quality. > It does not make it invalid > Incomplete MP relations are not beneficial to OSM quality. > MP with single outer and 0 inners is not invalid. (this does not make it desired and preferable, but in this case accusing iD of producing invalid relations is baseless and invalid)
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