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Re: [MMUSIC] The simulcast colon

Bo Burman <bo.burman@ericsson.com> Sat, 24 October 2015 17:20 UTC

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From: Bo Burman <bo.burman@ericsson.com>
To: "Mo Zanaty (mzanaty)" <mzanaty@cisco.com>, Peter Thatcher <pthatcher@google.com>
Thread-Topic: [MMUSIC] The simulcast colon
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Date: Sat, 24 Oct 2015 17:20:34 +0000
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Cc: "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] The simulcast colon
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I note that 4566bis ABNF for "attribute" says:

   ; sub-rules of 'a='
   attribute =           (att-field ":" att-value) / att-field
   att-field =           token
   att-value =           byte-string

The colon does not seem to be a "should" to me, but rather a requirement for any SDP attribute that is not a boolean.
Is there really any slack in how this can be implemented by SDP parsers?

To comply with 4566bis ABNF and still keep a single separator, you should rather remove the space.

/Bo

From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Mo Zanaty (mzanaty)
Sent: den 22 oktober 2015 15:48
To: Peter Thatcher
Cc: mmusic@ietf.org
Subject: Re: [MMUSIC] The simulcast colon

The colon was added after others pointed out that attributes with further parameters should have a colon after the attribute. I don't know how many parsers actually care about that rule, but it seems safer to stick with the convention even if it bothers a few human eyes.

Mo

On Oct 22, 2015, at 12:54 AM, Peter Thatcher <pthatcher@google.com<mailto:pthatcher@google.com>> wrote:
+1 to removing the colon

https://en.wikiquote.org/wiki/Consistency

On Wed, Oct 21, 2015 at 1:05 PM, Martin Thomson <martin.thomson@gmail.com<mailto:martin.thomson@gmail.com>> wrote:
Is annoying me.  Do we really need two separators (i.e., the colon and
the space)?

BTW,  the examples in the draft have c= and m= lines in the wrong
order, though I'm sure that I'm not the first to note this.

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