Re: [Slim] Collapse attribute syntax to one line in draft-ietf-slim-negotiating-human-language

[Randall Gellens <[e-mail]>]

I uploaded version -10, which includes the syntax change to single 
line, along with a few editorial clarifications.  (Version -09 
accidently omitted an editorial clarification.)

You can see a diff of the changes from 08 to 10 here:
https://www.ietf.org/rfcdiff?url1=draft-ietf-slim-negotiating-human-language-08&url2=draft-ietf-slim-negotiating-human-language-10

If there objections to the change from multi-line to single-line, 
this can be reverted.

--Randy



At 2:57 PM -0700 5/28/17, Randall Gellens wrote:

>  In response to Adam Roach's comments as well as other comments, I 
> intend to update the draft to collapse the attribute syntax to one 
> line; each attribute can occur at most once per media, with all 
> languages on the same line.  This will further reduce the size of 
> the SDP block.
>
>  If you object to this, please reply.
>
>  Here is the section of Adam's review:
>
>  At 8:31 PM +0000 3/28/17, Sabrina Tanamal via RT wrote:
>>   I'll note that much of this can be fixed if the syntax is collapsed so
>>   that each media section can have at most one hlang-send and one
>>   hlang-receive, each of which contain a list of one or more languages
>>   that can be sent or received. This is also much more consistent with the
>>   way SDP attributes are used in general. The presence of a "*" token on
>>   that line would indicate the "call should happen even without matching
>>   languages" characteristic; since there is only one place to add this
>>   indicator, the ambiguity of some lines indicating it and others not
>>   disappears. The preceding example would collapse to:
>>
>>   m=audio 49250 RTP/AVP 20
>>   a=hlang-send:es eu en *
>>   a=hlang-recv:es eu en *
>>
>>   ...and the example text would be revised to remove the implication that
>>   *sending* "es" necessarily implies *receiving* "es".
>>
>>   I'll further note that the majority of SDP libraries I've worked with
>>   would make accessing the all-on-one-line format easier than
>>   one-line-per-language as well.
>
>  Here is the proposed ABNF:
>
>     Attribute Syntax:
>
>        hlang-value =  Language-Tag *( SP Language-tag ) [ SP asterisk ]
>
>                             ; Language-Tag as defined in BCP 47
>
>        asterisk    =  "*"   ; an asterisk (ASCII %2A) character
>
>        sp          =  1*" " ; one or more ASCII space (%20) characters
>
>  --
>  Randall Gellens
>  Opinions are personal;    facts are suspect;    I speak for myself only
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>
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-- 
Randall Gellens
Opinions are personal;    facts are suspect;    I speak for myself only
-------------- Randomly selected tag: ---------------
Knowledge always desires increase; it is like fire, which must
first be kindled by some external agent, but which will afterwards
propagate itself.                       --Dr. Samuel Johnson