>-       applicability - does it identify and solve a problem?

I think it does. A specific case it simplifies is coordination of 
access control in federations.

>-       completeness - is there something missing?

I'm personally missing scenarios which
- use redirection as opposed to proxy mode. IMO, it is beneficial to have
  the AS operated in 3xx mode for better scalability. 
- use SAML-by-value, in addition to SAML-by-reference. I personally find
  the SAML-by-reference quite non-real-time and harder-to-scale too.
Perhaps there are arguments why proxy+by/reference is the best thing, but
if that's the case I think they should be mentioned in the document.

Other things have been tracked but the debates are IMO not yet visible
in the spec:
- reference of the SAML document to some parts of the initial SIP request
  so that it is harder to replay SAML permisssions (issue #5)
- backwards compatibility with Identity-info (#12)
- the by-value scenarios is here actually too .. (#9)


-jiri



--
Jiri Kuthan            http://iptel.org/~jiri/



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