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project_key: SOA See linked issue.
Link: Added: This issue depends MODE-1084
As mentioned on MODE-1084: Strictly speaking, the specification says it's possible to unregister a namespace that is already used. You can even re-register it with a different prefix, either at the session level (i.e., the mapping is local only to that session), or at the workspace level (the remapping appears for everyone). Of course in ModeShape, you have to have the correct privileges in order to unregister or register namespaces. So, this is not a defect. I'll leave it opened so we can discuss questions/comments/concerns, but this (as with MODE-1084) will eventually be closed as 'Rejected'.
As noted in the comments, this is not a defect, but is actually allowed by the JCR specifications. Therefore, rejecting.