[Openid-specs-ab] acr text

[Nat Sakimura]

Especially to John,

acr text says:

 An absolute URI or a registered
name<http://openid.bitbucket.org/openid-connect-messages-1_0.html#RFC6711>
[RFC6711]
MAY be used as an acr value.

Is it really MAY? Is it not MUST?

=nat
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