Hi Ran,
Just as a matter of principle, I think it's best to define what these things are, rather than what they're not. Never is a long time, and quite frankly it's not very descriptive. Better to say something like, "An identifier [or the thing it identifies] may change its location at any time, and may in fact be present in multiple locations."
Identifier: An object that is used only for identification, never for forwarding packets or determining location.
Locator: An object that is used only for forwarding packets or determining location, never for identification.
Eliot
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