Re: [MMUSIC] WGLC on draft-ietf-mmusic-sdp-simulcast-07

Iñaki Baz Castillo <ibc@aliax.net> Fri, 03 March 2017 16:42 UTC

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From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
Date: Fri, 3 Mar 2017 17:41:46 +0100
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To: "Dale R. Worley" <worley@ariadne.com>
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Cc: Flemming Andreasen <fandreas@cisco.com>, "mmusic@ietf.org" <mmusic@ietf.org>, draft-ietf-mmusic-sdp-simulcast@ietf.org
Subject: Re: [MMUSIC] WGLC on draft-ietf-mmusic-sdp-simulcast-07
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2017-03-03 16:56 GMT+01:00 Dale R. Worley <worley@ariadne.com>om>:
> That purported BNF is really bizarre, since it generates the clearly
> incorrect form:
>
>    a=rid:<rid-id> <direction> <restriction>=<value><restriction>=<value>
>
> A correct description is:
>
>    a=rid:<rid-id> <direction> ( pt=<fmt-list> | <restriction>=<value> ) *( ; <restriction>=<value> )
>
> The problem is that BNF doesn't allow you to directly specify what you
> want to say:  (1) pt is like a parameter, but if it's present, it must
> be first, and (2) there must be at least one pt or restriction.  And
> there's no simple construction for "a list of one or more X's separated
> by Y's".

Understood. But, anyhow, the a=rid lines in
draft-ietf-mmusic-sdp-simulcast-07 are wrong, right?


-- 
Iñaki Baz Castillo
<ibc@aliax.net>