[Slim] Sign language in the text stream is a valid combination for real-time communication

[Gunnar Hellström <[e-mail]>]

I just got aware of work with specifying sign language in text media.

It was by recent announcement of a new draft about Signwriting.

https://datatracker.ietf.org/doc/draft-slevinski-formal-signwriting/

I suggest that we let this cause a slight change in 
draft-ietf-slim-negotiating-human-language

I am copying to the author, Steve Slevinski.

We discussed earlier the unusual combinations of language and media. I 
told about Signwriting and other script systems for sign language in the 
text stream.
Signwriting in text can be explicitly indicated by combining a language 
subtag for the intended sign language with the script subtag for 
Signwriting -sgnw  ( thus for example    ase-sgnw   for American sign 
language written in text with the Signwriting script). In certain use 
the -sgnw may also be assumed and therefore omitted.

It is not at all common to use Signwriting in real-time conversational 
mode, but I think it is not good that we exclude it by a statement in 
section 5.4

In section 5.4, we say that sign language in written mode is undefined. 
With background from what I just found, I suggest that we at least allow 
it to be defined. We may also explain how sign language can be used in 
the text stream.

Therefore, I suggest this minimal change:
---------------------------old text 1 in 
5.4-------------------------------------

the behavior when specifying a spoken/written language tag for a video media stream, or a signed language tag for an audio or text media stream, is not defined.

--------------------------new text---------------------------------

the behavior when specifying a spoken/written language tag for a video media stream, or a signed language tag for an audio media stream, is not defined.

--------------------------end of change 
1------------------------------------

--------------------possible change 2 in 5.2----------------------------
--------------new paragraph three from end of 
5.2--------------------------------
Sign language in the text stream may occur, e.g. by use of an IANA 
registered script for notation of sign language.
Example: ase-sgnw     for American Sign Language written with 
Signwriting script.
---------------end of new paragraph in 
5.2------------------------------------


Regards
Gunnar



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Gunnar Hellström
Omnitor
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