Re: [sipcore] Benjamin Kaduk's No Objection on draft-ietf-sipcore-originating-cdiv-parameter-07: (with COMMENT)

Hi Benjamin,

We had email exchanges about the syntax and how to make it aligned with what has been designed (and is already implemented by networks).
Paul is correct existing syntax 1) is equivalent to 1a) by following ABNF rules.
The idea is to optimize the syntax so 1) should be the correct form.

Are you fine with that?

BR,
Marianne

-----Message d'origine-----
De : sipcore [mailto:sipcore-bounces@ietf.org] De la part de Paul Kyzivat
Envoyé : jeudi 6 décembre 2018 17:37
À : Benjamin Kaduk
Cc : sipcore@ietf.org
Objet : Re: [sipcore] Benjamin Kaduk's No Objection on draft-ietf-sipcore-originating-cdiv-parameter-07: (with COMMENT)

On 12/6/18 4:23 AM, Benjamin Kaduk wrote:

>     sessioncase-param        = "sescase" EQUAL ("orig"/"term")/ orig-cdiv
> 
> It's quite possible I'm just confused about the ABNF, but why do we need the
> grouping?

IIUC, you are asking if the above:

1) sessioncase-param  = "sescase" EQUAL ("orig"/"term")/ orig-cdiv

is equivalent to:

2) sessioncase-param  = "sescase" EQUAL "orig"/"term"/ orig-cdiv

The answer is no, it isn't. Using more bracketing to show the syntax 
more clearly, (1) is equivalent to:

1a) sessioncase-param  = ("sescase" EQUAL ("orig"/"term")) / orig-cdiv

while (2) is equivalent to:

2a) sessioncase-param  = ("sescase" EQUAL "orig") / "term" / orig-cdiv

	Thanks,
	Paul

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