Re: [OSM-dev] Duplicate IDs
It is a wiki, it can be updated by anyone. I tried to look for a sensible place to clarify about ids. This seems to be one place. http://wiki.openstreetmap.org/w/index.php?title=Elementsaction=historysubmitdiff=798652oldid=796271 Please do edit the wiki if what I've written is wrong, or if you find any other place where element ids should be explained. -- Gregory o...@livingwithdragons.com http://www.livingwithdragons.com ___ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
Re: [OSM-dev] Duplicate IDs
On 20 August 2012 08:06, Lukas Kabrt lu...@kabrt.cz wrote: I didn't find any indication that nodes, ways and relations have separate ID spaces, so I assumed that IDs are unique across all OSM entities. Thanks for correcting my mistake. It doesn't say anywhere that they share an ID space either. It certainly never occurred to me that they could, so it would never have occurred to me to state explicitly that they are separate. I think a line in the wiki would be sufficient. Have a nice day, -- Martijn van Oosterhout klep...@gmail.com http://svana.org/kleptog/ ___ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
Re: [OSM-dev] Duplicate IDs
Hi, I admit it is not clearly mentioned on the wiki ( should be changed ), except for: Node id's are unique only between nodes. (A way can have the same id. as a node.) on http://wiki.openstreetmap.org/wiki/Node Thanks for bringing it up :-) Best regards, Christian Vetter On Mon, Aug 20, 2012 at 8:29 AM, Martijn van Oosterhout klep...@gmail.com wrote: On 20 August 2012 08:06, Lukas Kabrt lu...@kabrt.cz wrote: I didn't find any indication that nodes, ways and relations have separate ID spaces, so I assumed that IDs are unique across all OSM entities. Thanks for correcting my mistake. It doesn't say anywhere that they share an ID space either. It certainly never occurred to me that they could, so it would never have occurred to me to state explicitly that they are separate. I think a line in the wiki would be sufficient. Have a nice day, -- Martijn van Oosterhout klep...@gmail.com http://svana.org/kleptog/ ___ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev ___ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
Re: [OSM-dev] Duplicate IDs
On Mon, Aug 20, 2012 at 3:38 AM, Jochen Topf joc...@remote.org wrote: On Sun, Aug 19, 2012 at 09:25:45PM +0200, Lukas Kabrt wrote: I have created a small library for parsing OSM data and one of the users reported a weird error. The root cause of this error is the fact that there are elements with duplicate IDs in the database. I have found at least this pair - http://www.openstreetmap.org/browse/way/49755010 and http://www.openstreetmap.org/browse/node/49755010 Before I start fixing this error, it would be nice to know whether this is an exceptional case or whether these kind of integrity violations happens more often. Has anyone seen other elements with duplicate IDs? What is the best way to fix it in the database? OSM has three types of objects: nodes, ways, and relations. And they all have their own number space. While this seems common knowledge to longtime OSM people, is this documented in the wiki? I looked at the following pages and nothing indicates that nodes, ways, relations, and changesets all have their own ID number space: http://wiki.openstreetmap.org/wiki/Elements http://wiki.openstreetmap.org/wiki/API_v0.6 Is there another page stating this? It's possible that someone relatively new to OSM might commit the same mistake of assuming that all elements of any type have unique IDs. ___ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
Re: [OSM-dev] Duplicate IDs
On Sun, Aug 19, 2012 at 3:25 PM, Lukas Kabrt lu...@kabrt.cz wrote: Before I start fixing this error, it would be nice to know whether this is an exceptional case or whether these kind of integrity violations happens more often. Has anyone seen other elements with duplicate IDs? What is the best way to fix it in the database? I'm going to assume from your name and your domain that English isn't your first language, but I think it needs mentioning that stating that this is an integrity violation is a bit offputting. As others have mentioned (as well as the OSM documentation), IDs are not guaranteed to be unique across element types, and so if your code does, then this is simply a bad assumption on your part. You may not have intended your mail to sound like you were blaming OSM developers for being in error, but that's how it came off. - Serge ___ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
