[suggestion] Optionnal support for relation of relation aka "super-relation"

[sletuffe]

For some needs it could be usefull if an optionnal switch param could enable support for "super-relation" (those relation whose members are relations whose members (...) are ways) in order to have geometries for them.

Such existing relation are quite rare atm but could include :
type=route for long route made of other routes
http://www.openstreetmap.org/browse/relation/20772
Country boundaries :
http://www.openstreetmap.org/browse/relation/1111111
http://www.openstreetmap.org/browse/relation/11980

[pnorman]

Given the typical rendering usecase, I'm not sure that type=route superrelations gain us anything since they'd be rendered from their members anyways.

For the first boundary example, it duplicates http://www.openstreetmap.org/relation/51477, which is a conventionally represented boundary relation for Germany.

[pnorman]

There doesn't seem to be interest in this and it's not obvious that we should be doing it anyways, given the duplication that would then be present.

[stefanct]

I think this decision should be reconsidered. It would reduce the need to ever duplicating the same values in all members of very large relations (e.g., eurovelo bicycle routes) (or breaking the rendering as happens quite regularly if someone does not know or forgets).