Re: [Last-Call] [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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