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Re: [Slim] Moving forward on draft-ietf-slim-negotiating-human-language

Martin J. Dürst <duerst@it.aoyama.ac.jp> Wed, 22 November 2017 05:48 UTC

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To: Gunnar Hellström <gunnar.hellstrom@omnitor.se>, Bernard Aboba <bernard.aboba@gmail.com>
Cc: slim@ietf.org, Randall Gellens <rg+ietf@randy.pensive.org>
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From: "Martin J. Dürst" <duerst@it.aoyama.ac.jp>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/slim/hfhmvfutDM1zkeKy_pr_mqOUJ0A>
Subject: Re: [Slim] Moving forward on draft-ietf-slim-negotiating-human-language
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On 2017/11/21 06:14, Gunnar Hellström wrote:
> A new proposal for new text taking in latest discussion of Bernard, Paul 
> and Brian:

> -----New text------------
> 5.4 Media, Language and Modality indications

> A sign language can be identified by the existence in the IANA registry 
> of language subtags according to BCP 47 [RFC5646] of the language subtag 
> with the Type field "extlang" combined with the Prefix field value "sgn".
> A specific spoken or written language can be identified by not having 
> any such "sgn" Prefix.

https://tools.ietf.org/html/rfc5646#section-3.4, point 12.C.3, currently 
says:

             3.  Sign languages SHOULD have an 'extlang' record with a
                 'Prefix' of 'sgn'.

As everybody here on this list knows, a SHOULD is not a guarantee, 
because there might be exceptions. The fact that there currently are no 
exceptions doesn't guarantee that there will be no exceptions in the future.

Regards,   Martin.

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