[Openid-specs-ab] Issue #1430: How to determine SIOP support? (openid/connect)

[tlodderstedt]

New issue 1430: How to determine SIOP support?
https://bitbucket.org/openid/connect/issues/1430/how-to-determine-siop-support

Torsten Lodderstedt:

By looking at the Discovery document, a RP cannot determine if an OP is a SIOP or a “traditional” OP. I could also imagine an OP to support both “modes of operation”.

What comes to mind is the introduction of new values for `subject_types_supported`. Could be just `self-issued`.  

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