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Re: [Gen-art] Genart last call review of draft-ietf-mmusic-msrp-usage-data-channel-21

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 13 July 2020 20:51 UTC

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To: Paul Kyzivat <pkyzivat@alum.mit.edu>, gen-art@ietf.org
Cc: draft-ietf-mmusic-msrp-usage-data-channel.all@ietf.org, last-call@ietf.org, mmusic@ietf.org
References: <159459362316.14150.6160122631877971567@ietfa.amsl.com> <98047ac3-6539-bed6-d869-7bf503e6f4a0@alum.mit.edu>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Tue, 14 Jul 2020 08:51:07 +1200
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Archived-At: <https://mailarchive.ietf.org/arch/msg/gen-art/GRFtsaQlMzn2MTWyq1Lgdws7F4s>
Subject: Re: [Gen-art] Genart last call review of draft-ietf-mmusic-msrp-usage-data-channel-21
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On 14-Jul-20 02:58, Paul Kyzivat wrote:
> Brian,
> 
> On 7/12/20 6:40 PM, Brian Carpenter via Datatracker wrote:
> 
>> Nits:
>> -----
>>
>>>> 4.1.  MSRP URI
>> ....
>>>>      transport  /= "dc"
>>
>> I see that RFC7977 takes a slightly different approach to updating the ABNF:
>>
>>>>      transport  =  "tcp" / "ws" / 1*ALPHANUM
>>
>> The advantage of listing out
>>
>>    transport  =  "tcp" / "ws" / "dc" / 1*ALPHANUM
>>
>> would be that the reader sees the full list.
> 
> While it might be nice to see the full list, it can't be counted on to 
> remain the full list. If each update did this, then every draft that 
> updates the list should formally Update every other document that 
> updates the list.
> 
> The *point* of /= in abnf is that it decouples the particular addition 
> from all others.

Sure, I realise that. But...
 
> This sort of thing should really have an IANA registry. But often the 
> expectation is that changes aren't made often enough to justify that. 

Indeed, that occurred to me as an alternative approach but a registry
with 3 entries is a bit light (and also, readers starting at RFC4975
wouldn't know to look for the registry).

> Lacking that, IMO /= is the preferred way to go.

It was only a nit...

    Brian

> 
> 	Just kibitzing,
> 	Paul
> 
> 
>

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