Spring security openid attributes exchange

hi,
I am using grails 1.3.7 and now installed spring security openid plugin. I have created a sample application by following this url
http://burtbeckwith.github.com/grail...ual/index.html

I am able to login through open id but problem is that, that i want users basic information(i.e email. firstname etc) when openid provider authenticates the user. There is no documentation on how to exchange attributes.
Anybody who has implemented this..??? Please suggest what configurations i need to do to get user other informations.. Currently i am only getting user openid url.

Thanks

Moved to the grails forum, since this is a more appropriate location for the question.