realm-based identifier differentiation

[matake@gmail]

Hi experts,

I have an issue related to realm-based identifier differentiation which Google is doing.

We are plaining to change our domain (= realm).
After that, we can't identify the Google OpenID users because their OpenID identifier changes.

Do you have any solution for that, or any other places/person I should ask?

ps.
I would like OpenID spec allows using non-realm RP identifier (ie. OAuth consumer key?), I'm not sure the realm-base identifier differentiation itself is in the spec though.

--
Nov Matake (=nov)
http://matake.jp
http://twitter.com/nov