[Openid-specs-ab] Policy based assertion

[nara hideki]

Hi,

I'm writing policy base contract issuing in CX and that is to be
implemented in Request File Registration Service
of OpenID Artifact Binding.
Thinking of that,  OpenID AB itself should implement the policy based
assertion issuing and it basically same
as authorization manager issues "Requester Access Token" to "requester" in UMA.

Regards
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hideki