[Slim] Ben Campbell's Yes on draft-ietf-slim-negotiating-human-language-22: (with COMMENT)

[Ben Campbell <[e-mail]>]

Ben Campbell has entered the following ballot position for
draft-ietf-slim-negotiating-human-language-22: Yes

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COMMENT:
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I'm balloting "yes" because I think this is important work, but I have some
comments:

Substantive Comments:

- General: It seems to be that this is as much about human behavior as it is
capabilities negotiating. Example case: I make a video call and express that I
would like to receive Klingon. (Is there a tag for that ? :-) The callee can
speak Klingon and Esperanto, so we agree on Klingon. What keeps the callee from
speaking Esparanto instead?

I realize we can't force people to stick to the negotiated languages--but
should we expect that users should at least be given some sort of UI indication
about the negotiated language(s)? It seems like a paragraph or two on that
subject is warranted, even if it just to say it's out of scope.

-1, paragraph 6:  (related to Ekr's comments) Does the selection of a single
tag in an answer imply  an assumption only one language will be used? There are
communities where people tend to mix 2 or more languages freely and fluidly. Is
that sort of thing out of scope?

- 5.1, paragraph 2:  Can you elaborate on the motivation to have a separate
hlang-send and hlang-recv parameter vs having a single language parameter and
instead setting the stream to send or receive only, especially in light of the
recommendation to set both directions the same for bi-directional language
selection? I don't mean to dispute that approach; I just think a bit more
explanation of the design choice would be helpful to the reader.  I can imagine
some use cases, for example a speech-impaired person who does not plan to speak
on a video call may still wish to send video to show facial expressions, etc. 
(I just re-read the discussion resulting from Ekr's comments, and recognize
that this overlaps heavily with that.)

-5.1, paragraph 3: "... which in most cases is one of the
   languages in the offer's..."
Are there cases where it might not?

-5.1, last paragraph: "This is not a problem."
Can you elaborate? That sort of statement usually takes the form "This is not a
problem, because..."

-5.2, last paragraph: Is there a reason to give such weak guidance on how to
indicate the call is rejected?  (Along those lines, are non-SIP uses of SDP in
scope?)

Editorial Comments and Nits:

-5.1, paragraph 4: The first MUST seems like a statement of fact.