Version numbers and optimistic locking
The planet dump, diffs and the API calls for elements will return a version attribute for each element (node, way and relation). These version numbers are used for optimistic locking.
| nodeVersion_example.xml | |
|---|---|
To upload a new version of an object, the client will need to provide the version of the object it is modifying. If the version supplied is not the same as the server's current version, an error will be returned. This means that any client that is updating data will need to save the version numbers of the original data. One element can be updated multiple times during one changeset and its version number is increased each time (so there can be multiple history versions of a single element for one changeset).
Error codes
HTTP status code (400-500).
Conflict between the current state of a resource and the client's request.