The OpenID Connect Relying Party Metadata Choices 1.0 specification has been approved as a Final Specification by the OpenID Foundation membership. The declarations enabled by this specification give an OpenID Provider the information needed to successfully interact with a Relying Party that has not previously registered with it.

As I wrote when this became an Implementer’s Draft, the need for this was independently identified by Roland Hedberg and Stefan Santesson while implementing OpenID Federation. The contents of the specification were validated by Filip Skokan, who implemented it, and who is an author.

The abstract of the specification is:

This specification extends the OpenID Connect Dynamic Client Registration 1.0 specification to enable RPs to express a set of supported values for some RP metadata parameters, rather than just single values. This functionality is particularly useful when Automatic Registration, as defined in OpenID Federation 1.0, is used, since there is no registration response from the OP to tell the RP what choices were made by the OP. This gives the OP the information that it needs to make choices about how to interact with the RP in ways that work for both parties.

Finishing things matters. Thanks to all who contributed to this achievement!