[Openid-specs-ab] acr values

[mike at gluu.org]

John,

Nat also made the case to me a while back that ACR could be used for 
domain or federation level policy. One of the reasons we implemented our 
own solution was because it was unclear how to use ACR. Perhaps more 
examples in the documentation would be helpful. Are you proposing that a 
domain could have an acr value such as "http://example.com/auth_level/0" 
?

- Mike