On 6/27/2015 1:14 PM, Fernando Trebien wrote:
Actually no, the server checks for circular dependencies, and a
relation pointing to itself is a cycle. Try it, the server returns a
validation error.
Nothing in the OSM data model prohibits a relation that references
itself, or relations that form a cycle.
As an example, see https://www.openstreetmap.org/relation/1368401 which
contains itself twice. Longer cycles are also possible.
I can't imagine a case where a cycle is sensible, and they are often
difficult to delete, first requiring modifying the relations to remove
the cycle, then deleting the relations.
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