Re: [Slim] Eric Rescorla's No Objection on draft-ietf-slim-negotiating-human-language-19: (with COMMENT)
Eric Rescorla <ekr@rtfm.com> Sun, 07 January 2018 14:35 UTC
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From: Eric Rescorla <ekr@rtfm.com>
Date: Sun, 07 Jan 2018 06:34:39 -0800
Message-ID: <CABcZeBOR=XbNN_tR8-XE_UJ3=Xak5Qaim4xQQMLuTCiWmxXY7A@mail.gmail.com>
To: Randall Gellens <rg+ietf@randy.pensive.org>
Cc: The IESG <iesg@ietf.org>, slim@ietf.org, draft-ietf-slim-negotiating-human-language@ietf.org, slim-chairs@ietf.org, Bernard Aboba <bernard.aboba@gmail.com>
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Subject: Re: [Slim] Eric Rescorla's No Objection on draft-ietf-slim-negotiating-human-language-19: (with COMMENT)
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On Sat, Jan 6, 2018 at 7:22 PM, Randall Gellens <rg+ietf@randy.pensive.org> wrote: > At 5:39 PM -0800 1/6/18, Eric Rescorla wrote: > > Document: draft-ietf-slim-negotiating-human-language-17.txt >> >> 1. I'm not marking this first point DISCUSS, but I do think it's >> important it be addressed and I trust the AD will ensure that it is. >> This document is ambiguous about the contents of the answer >> attribute. Specifically, it says: >> >> In an answer, 'hlang-send' is the language the answerer will send if >> using the media for language (which in most cases is one of the >> languages in the offer's 'hlang-recv'), and 'hlang-recv' is the >> language the answerer expects to receive if using the media for >> language (which in most cases is one of the languages in the offer's >> 'hlang-send'). >> >> However, the next paragraph permits >1 tag, as does the ABNF in S 6.1. >> >> Each value MUST be a list of one or more language tags per BCP 47 >> [RFC5646], separated by white space. BCP 47 describes mechanisms for >> matching language tags. Note that [RFC5646] Section 4.1 advises to >> "tag content wisely" and not include unnecessary subtags. >> >> So, how am I supposed to interpret an answer with >1 tag? Is this >> forbidden? I can imagine a number of semantics, but it's important >> it be clear in the document. >> > > Thank you for catching this. I think the first paragraph is correct and > the second paragraph and ABNF are in error, they were copied from the offer > and not fixed. The intent is that a single language per direction be > arrived it per media stream. > > > 2. The negotiation structure here does not match that which is >> conventionally used with SDP, where each side indicates the formats it >> is prepared to receive and the other side can send any of them. Why >> did you use this structure? One reason you might is that you expect >> the answer to resolve which language is in use, however because SIP >> supports early media (i.e., media which is delivered prior to the >> answer.) >> > > In light of my reply to (1), do you still feel that the negotiation > structure doesn't match usual offer/answer behavior? Yes. That doesn't necessarily mean it's wrong, of course. Conventions are just that, conventions. -Ekr > > > -- > Randall Gellens > Opinions are personal; facts are suspect; I speak for myself only > -------------- Randomly selected tag: --------------- > We do not stop playing because we grow old; we grow old because we stop > playing. --U.S. Supreme Court Justice Oliver Wendell Holmes >
- [Slim] Eric Rescorla's No Objection on draft-ietf… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Bernard Aboba
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Bernard Aboba
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens (IETF)
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Paul Kyzivat
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Bernard Aboba
- Re: [Slim] Eric Rescorla's No Objection on draft-… Bernard Aboba
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Paul Kyzivat
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Paul Kyzivat
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Paul Kyzivat
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- [Slim] Updated version addresses comments receive… Randall Gellens
- Re: [Slim] Updated version addresses comments rec… Randall Gellens
- Re: [Slim] Updated version addresses comments rec… Randall Gellens