register the "UMA" auth scheme with IANA

[xmlgrrl]

We should register the "UMA" auth scheme with IANA:

http://www.iana.org/assignments/http-authschemes/http-authschemes.xhtml

This appears to have been an oversight. It should probably be an erratum on V2.0 if that's possible, as it's a non-normative change.

[xmlgrrl]

Lodged a registration request using this form.

[xmlgrrl]

(Extremely) belatedly reporting that I received a response (immediately) from [email protected] as follows:

Dear Eve,

Thanks for contacting us.

We're unable to make an assignment from the HTTP Authentication Schemes registry. This registry requires IETF Review,
which according to RFC 8126 requires an IETF-stream I-D approved for publication by the IESG:

https://tools.ietf.org/html/rfc8126#section-4.8

There is an early/temporary allocation process available to IETF-stream I-Ds. RFC 7120 early allocation allows for
temporary registrations, marked "(TEMPORARY)" in the registry, that can be renewed annually until the documents are
approved for publication (note that renewals after the second year must be approved by the IESG).

However, this method requires that the process described by Section 3 of RFC 7120 be followed:

https://tools.ietf.org/html/rfc7120#section-3

Please let us know if you have any questions.

Best regards,

Sabrina Tanamal
Senior IANA Services Specialist

In our current circumstances, I believe that this means we won't be able to complete this item.