Comment 2 for bug 81102

This is not trivial since tags may be in different locations across svn repositories.

Just taking the revision in which the tag was created in svn won't help, since that will be a revision that's not actually in your bzr branch.

You would have to take the revision from which the tag was created, but that's not going to be correct in a lot of cases either, since the revision that created the tag could also have slightly modified it.