I think the worst case to revert is mass deletion - only Potlatch have some facilities to find deleted lines given a BBOX, and only lines, not POIs or relations. Such deletion is quite hard to spot.
As for reverting changesets - there is list of nodes/ways/relations that was either added, changed or deleted in the changeset XML, so for changed stuff, you can retrieve the previous version from history (using the version from changeset as the "id of old version"), for new stuff, you add action="delete" into the XML and for deleted stuff, you recreate the last version (could be a bit tricky for deleted ways with nodes, as you'll have to mangle the ID's a bit ...) It shouldn't be probably hard to write such a thing ... perhaps some of existing tools can be just a little adapted to produce this. Load this into JOSM, use the conflict resolution in there to sort things out (if someone tries to fix the thing manually) and upload ..... changeset effectively reverted. Martin _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
