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

Paul Kyzivat <pkyzivat@alum.mit.edu> Mon, 13 July 2020 14:58 UTC

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To: Brian Carpenter <brian.e.carpenter@gmail.com>, 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>
From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/gen-art/xE_cN2jrd3o4vLWhEv8FpvCFdSE>
Subject: Re: [Gen-art] Genart last call review of draft-ietf-mmusic-msrp-usage-data-channel-21
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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.

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

	Just kibitzing,
	Paul

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