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Re: [MMUSIC] [Technical Errata Reported] RFC4566 (5595)

Keith Drage <drageke@ntlworld.com> Wed, 16 January 2019 12:13 UTC

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From: Keith Drage <drageke@ntlworld.com>
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Date: Wed, 16 Jan 2019 12:13:08 +0000
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Subject: Re: [MMUSIC] [Technical Errata Reported] RFC4566 (5595)
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Paul wrote: "As it is, the text reads as normative, but the ABNF should 
really be the formal authority, with this being just a summary. "

While that might be a convention, formally it only applies if there is a 
statement in the RFC or draft that says it. Otherwise any normative 
statements in the text and the ABNF have to be taken as complementary to 
each other, and equally normative. As far as I am aware, there is no 
generic overarching RFC that states ABNF takes precedence over all other 
material.

Indeed in other RFCs, it has been necessary to enhance the ABNF with 
additional normative text statements, because either it is impossible to 
express the requirement in ABNF, or because the ABNF representation 
would be too complex.

regards

Keith

On 09-Jan-19 4:36 PM, Paul Kyzivat wrote:
> On 1/8/19 9:19 PM, Dale R. Worley wrote:
>
>> Look back on this and ask yourself, What is "the order given"?
>>
>> It looks like the order is "session description" followed by "time
>> description" followed by "media descriptions, if present".  But it's
>> not.  "The order given" covers only the section titled "Session
>> description" -- "Time description" is included within it by reference in
>> the 10th item, and "Media description, if present" is included within it
>> multiply by reference in the 14th item.  (Compare with the grammar in
>> section 9.)
>>
>> In particular, time descriptions come before session attributes.
>>
>> So it would really help if this text was clarified in 4566bis.
>
> 4566bis has already been submitted to the iesg, making it harder to 
> revise now.
>
> Do you have a thought about how to improve it? As it is, the text 
> reads as normative, but the ABNF should really be the formal 
> authority, with this being just a summary.
>
>     Thanks,
>     Paul
>
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