Existing Wording: Once assigned, the identity is never changed, though copies of the same resource made elsewhere may not retain the same identity.

…

Copying or moving resources from one server to another means that resources acquire a new identity. For further details, see Managing Resource Identity.

Proposed Wording: Once assigned, the identity is never changed, though copies of the same resource made elsewhere may not retain the same local identity.

…

Copying or moving resources from one server to another means that resources acquire a new full identity, which may or may not include a new local identity. For further details, see Managing Resource Identity.

Comment:

"may not" sounds like it means "might or might not" i.e., is ambiguous, but then the next paragraph says that "resources acquire a new identity" on a new server. The confusion in this section arises from referring initially to the relative identity within a server and resource (e.g., patient id="123"), which I'll call the "local" identity. Then the second paragraph still says "identity" but means the "full identity" i.e., the URL. So moving to a different server will definitely change the full identity, but might not change the "local" identity. If my understanding is correct, the proposed wording tries to explain the distinction between local identity and full identity. In any case, I suggest the wording of this section be clearer.