Re: Comments on draft-ietf-sip-body-handling-02

Because it is still missing the "SHOULD minimize nesting, unless X".  
What is the sensible X guidance to give?

On Sep 26, 2008, at 5:08 PM, [email protected] wrote:

>   From: "DRAGE, Keith \(Keith\)" <[email protected]>
>>> 3)	Section 4.3:
>>>
>>>   UAs SHOULD avoid unnecessarily nesting body parts because
>>>   doing so would, unnecessarily, make processing the body more
>>>   laborious for the receiver.
>>>
>>> I had some problem with this because it seems an impossible
>>> statement to determine conformance to. Is the RFC 2119 language
>>> therefore appropriate.
>>
>> Well, you are right that the "unnecessarily" makes it sound
>> like a motherhood-and-apple-pie statement. But you could
>> actually check conformance to it. If an implementation nests
>> a body part without having a specific reason to do it, then
>> it is not conformant. Any implementer should know why he or
>> she is doing something. So, I would like to keep the
>> capitalized SHOULD. In any case, if you have a strong opinion
>> on this, it would not be a big deal for me to make the
>> statement non-normative instead.
>
>   The key thing we need to do is write a statement where we clearly
>   understand whether the implementor has chosen not to apply the
>   constraint.
>
>   Is it possible to write "SHOULD NOT nest" in this case, and then
>   give some examples of where we might expect that to be broken. That
>   then gives a clear test of conformance to the requirement, and the
>   assessor of conformance can then decide whether breaking the SHOULD
>   was acceptable or not.
>
> Why don't we say "UAs SHOULD minimize nesting of body parts."?
>
>    minimize --verb
> 	1. to reduce to the smallest possible amount or degree.
>
> Dale
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