Ok, that is exactly right. :) An object in the system will never change it's ID but it can be replaced with a new object (representing the same real world thing) that has a new id.
Jim Brown -CTO CloudMade (Sent from my iPhone) On 31 Mar 2010, at 08:00, "Frederik Ramm" <[email protected]> wrote: > Hi, > > Jim Brown wrote: >> Frederik wrote: >>> You should never assume that OSM Way IDs (or indeed any IDs) remain >>> unchanged. The "data" layer on www.openstreetmap.org is your >>> friend if >>> you want to find out the history of a particular stretch of >>> motorway. >> >> If the ids change it makes diff processing a bit difficult... > > Full diff processing will be unaffected if someone deletes a stretch > of > motorway and re-creates it with a different id. > > It is only if you would, for example, import all motorways into your > own > database and then try to process diffs regarding these, without > processing diffs that would create new motorways. In that case, if > someone deletes something and re-creates it, you will lose it. > > Bye > Frederik _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
