In einer eMail vom 19.11.2009 07:39:18 Westeuropäische Normalzeit schreibt morrowc.lists at gmail.com:actually I think the ID doesn't have to be globally unique. It's
convenient if it is (today), but it need not be globally unique.It would be useful to get to some destination user by knowing his globally unique identitfier plus the (regional) scope of his location, in case the precise location is not known. I know this is not currently available technology, but think about it. (it might help searching for the right namespace for locators:-)
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