Karl Guggisberg wrote: >> This is probably something that the OSM editors should warn users about >> when they try to create such a relation. > JOSM doesn't allow to create recursive relations, but it accepts them when > they are present in the data.
JOSM has in the past accepted recursive relations and it is very likely that people still have versions running that do so. Maarten > -----Ursprüngliche Nachricht----- > Von: [email protected] [mailto:[email protected]] Im > Auftrag von Andrew M. Bishop > Gesendet: Sonntag, 13. September 2009 11:56 > An: [email protected] > Betreff: [OSM-dev] Recursive relations > > In OSM a relation can contain other relations but it seems that there is > nothing to check that a relation doesn't contain itself. I can't think of > any legitimate reason that it should be allowed though. > > For example relation 15852 has contained itself since version 108 which was > created at the beginning of July (changeset 1754423). > > Within the UK alone the following route relations all contain > themselves: > > 12179 > 15852 > 80545 > 101440 > 163368 > 165638 > 165638 > 167468 > 168189 > 170290 > 170290 > > Also within the UK there is one boundary relation that contains > itself: > > 57535 > > > Obviously it is possible to ignore these when parsing the data (which is > what I do and what alerted me to them in the first place) but it would be > better if it didn't happen. > > > This is probably something that the OSM editors should warn users about when > they try to create such a relation. > > Is there somebody that can find and fix all such relations on the server (if > they have no legitimate use)? > > Obviously self-recursion is easy to find; there might be mutually recursive > relations as well but I haven't looked for them. > > -- > Andrew. > ---------------------------------------------------------------------- > Andrew M. Bishop [email protected] > > UK OpenStreetMap Route Relations: > http://www.gedanken.org.uk/mapping/osm-routes/route.html > > UK OpenStreetMap Boundary Relations: > http://www.gedanken.org.uk/mapping/osm-boundaries/boundary.html _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
