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> On 16. Apr 2019, at 09:13, Joseph Eisenberg <joseph.eisenb...@gmail.com> > wrote: > > A "group" usually has more than 2 members, but I can't think of an > objective cut-off point above 2 or 3. If "three's a crowd" it's also a > group, no? > > So I think it's reasonable for mappers using place=archipelago to > describe a group of as few as 2 or 3 islands. > > Similarly, if you use a tag like "natural=lake_group" to describe > named groups of interconnected lakes, this could be used for as few as > 2 or 3 lakes, or as many as hundreds. the group relation requires at least 2 objects: https://wiki.openstreetmap.org/wiki/Proposed_features/Group_Relation It may not be absolutely typical natural language to speak of a group of two, but proposing also a pair relation seemed overkill ;-) and a group of three is fine. You would not need to specify whether it is a group of trees, lakes or islands, because it should be implicit through the members, but of course you could add tags like natural=archipelago if it makes sense to you. Cheers, Martin
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