[OSM-talk] Are osm ids unique?

Nop ekkehart at gmx.de
Wed Jan 14 07:01:19 GMT 2009


Hello!


Are the ids of osm objects unique?

A) globally unique

B) unique only within the type of object, so the same id may occur with 
a way, a node and a relation.

C) unique only within the type of object, but with non-intersecting 
numbering schemes


According to the wiki it is B) [1]

In my data processing I have so far assumed A) and never encountered a 
problem.


What are the facts?


thanks

   Nop



[1] http://wiki.openstreetmap.org/wiki/Database_schema




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