John,

>>  access_token=saml.fhHFhgf6575fhgFGrytr

> What is the advantage of doing it this way over having a separate field?

Client simplicity (code and mental model).

> What if the format is a URI?

That is a choice between the AS and PR that is irrelevant to the client app -- 
so why should the client app have to worry about it (and any extra escaping it 
entails).


>> There can be an IANA registry for prefixes if that is helpful.

> Personally, I'd like to see this solution be a bit more distributed, and a 
> registry isn't.

I hope there aren't so many common, shared formats that a distributed solution 
is necessary. But you can make the prefix a domain name, or a base64url-encoded 
URI, or a hash of a URI etc if you really want it distributed.


Andrew Arnott said:
> But token_format is not the idea I think.  It's more like token_origin.

I hope we don't need a 3rd "opaque string" for the client app to transfer from 
the AS to PR.

--
James Manger

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