Gregor Horvath <[email protected]> wrote: > Hi, > > Am Mon, 01 Aug 2011 09:21:44 +0200 > schrieb Frederik Ramm <[email protected]>: > > > That was me. There are a number of other reasons why IDs could > > "break". One is the expansion of POI nodes into buildings that Toby > > mentioned. Another is the splitting of ways (old ID would then point > > to only half) or merging (old ID would become invalid in 50% of > > cases). Same with the re-structuring of relations or the re-mapping > > of stuff in the course of the license change. > > It is a logically inaccurate to delete an ID in such cases. > What you actually logically do is replacing an ID, or creating an > alias. > The problem is there is no semantic in OSM data to express such a move > operation. Deleting is the wrong one. Deleting means a destroyed house > or physically removed street and in this case it is logically correct > that the ID is gone. > > So my proposal is to describe move operations in OSM data. > For example: Instead of deleting, all tags of the object or removed > and > a "alias_for" "joined_with" "splitted_to" tag(s) which points > to the new correct node(s) ID is inserted to the old node . > > Than external programs can find the proper one with the old id and the > OSM data gets richer and more accurate. > > -- > Greg > > _______________________________________________ > talk mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk
Preferably "split_to", rather than "splitted_to", since there is no such English word as "splitted". Otherwise, this sounds like a good idea. Note that there might need to be multiple instances of such a tag, with some form of version information as part of the value. For example, a POI node might later be joined to be part of an area representing a shop; this shop area might later be joined to others to represent an entire building that contains several shops. -- John F. Eldredge -- [email protected] "Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
