I submitted a PR to update XEP-0294 here:
https://github.com/xsf/xeps/pull/1044
after Chrome 89 (after a lot of time) started shipping the
a=extmap-allow-mixed attribute (which old Chrome versions wrongly
attempted to parse as a=extmap: ...)
There are two meta issues here (and as the council rightly pointed out
this should be discussed on standards@ anyway):
1/ how do we handle updates to normative IETF references?
In this case it is not a big issue since, as Jonathan Lennox pointed
out, RFC 8285 was designed to be backward compatible.
The addition of the attribute to the schema should be backward
compatible so doesn't require a namespace version bump imo.
2/ a long-standing issue about not having an equivalent to the session
level description SDP has.
I didn't attempt to solve it but this required writing some extra text.
See XEP-0338 for another instance of this. If you're dealing with
browser you might be aware that Firefox puts the ice-ufrag/ice-pwd at
that level.
Thoughts?
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