[OpenID] Doubt about identifier

[Kleber - Corujito]

Hi everyone! I'm new here and I have some doubts.

OP returns something that identifiers users uniquely.

Must (or should) OP return always the same identifier for an user?
if not, that is bad to RPs, isn't?

I noticed that I have different ways to use my Google openid and each one
may return something different (or RPs are doing something wrong).
ex:
https://www.google.com/accounts/o8/id (OP identifier)
http://google.com/profiles/LOGIN
http://www.google.com/profiles/1234567890
https://www.google.com/accounts/o8/id?id=blablablablabla

Thanks
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