On 21.01.2018 17:48, OSMDoudou wrote:
> When I tag the perimeter with indoor=room instead of building=yes, JOSM 
> raises an error "Overlapping ways" for the segment B->C in this kind of 
> layout:
[...]
> If I change the tags from indoor=wall to building=yes, no error is raised 
> anymore (but then of course, Osmose will report overlapping building, which 
> is the start of this discussion).

It's just a case of JOSM's validator not knowing about indoor=* yet. So
it produces incorrect warnings that can safely be ignored

There was a recent mention of the same problem on help.osm.org:
https://help.openstreetmap.org/questions/61383/josms-overlapping-ways-warnings-when-mapping-indoors

I believe the list of tags that needs to be extended to fix the issue is
the same as it was with a similar issue (overlapping way warning with
waterway=riverbank), but I'm not very familiar with JOSM's codebase:
https://josm.openstreetmap.de/ticket/9140

> It seems indoor walls cannot overlap. Same if I try indoor=room.

Note that unlike indoor=room, overlapping indoor=wall segments are
indeed an error.

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