I wanted to know if I can change my open ID url from say:

www.abc.com/username

to

www.pqr.com/username

while the relying party still thinks I am the same user?

or even say:

www.abc.com/something/username

to

www.abc.com/somethingelse/username

I intuitively think that this is not possible since if it were, then it is possible for anyone to spoof anyone else's identity.

Also, does Open ID specify which fields the relying party should use to ensure secure determination of the user's identity? For example, I would expect it to club the URL provided with the username/email address sent back by the Open ID server.