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Re: [sipcore] Alissa Cooper's No Objection on draft-ietf-sipcore-sip-push-21: (with COMMENT)

Paul Kyzivat <pkyzivat@alum.mit.edu> Wed, 09 January 2019 22:08 UTC

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Subject: Re: [sipcore] Alissa Cooper's No Objection on draft-ietf-sipcore-sip-push-21: (with COMMENT)
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On 1/9/19 2:41 PM, Ben Campbell wrote:

> I can see why that specific "MUST... unless” may not be appropriate, given the vagueness of the condition and the way we’ve constructed “MUST support/SHOULD use” requirements for TLS in the past.
> 
> But are you suggesting that conditional MUSTs are never appropriate?  I’ve been recommended “MUST ... unless...” constructions for cases where the MUST is true except in enumerated special cases. “SHOULD” doesn’t really accomplish the same thing, since a SHOULD as defined by 2119 allows for exceptions beyond those enumerated in the spec.

"MUST X unless Y" is equivalent to "If not Y then MUST X".

The latter seems perfectly fine to me. Because the former is equivalent 
I see no reason to forbid it. I think which one is clearest may depend 
on the situation.

	Thanks,
	Paul

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