Re: draft-ietf-sip-body-handling-03

[email protected] wrote:
>    From: Paul Kyzivat <[email protected]>
> 
>    > Section 12.1 makes it clear that for multipart/alternative, only the 
>    > handling property for the selected alternative matters.
> 
>    So you are saying that a multipart/alternative may have several parts 
>    with handling=required, and that I only have to be capable of handling 
>    the part I choose?
> 
> RFC 3459 uses multiparts in a somewhat different way that SIP does.
> In SIP, the I-D suggests that components of a multipart/alternative
> should have handling=optional and that the processor should ignore the
> handling parameter:
> 
> 	The UA SHOULD also set the 'handling' parameter of all the
> 	body part within the 'multipart/alternative' to 'optional'
> 	(the receiver will process the body parts based on the
> 	handling parameter of the 'multipart/alternative' body; the
> 	receiver will ignore the handling parameters of the body
> 	parts).
> 
> 	The receiver SHOULD ignore the handling parameters of the body
> 	parts within the 'multipart/ alternative'.

Right. But the SHOULD without qualification suggests that somebody might 
do otherwise, and we don't know under what circumstances that might 
happen. So if somebody sets all the parts to handling=required, it seems 
that the handling of the unselected parts will still be ignored.

Suppose I want to send a MESSAGE, and I require that some form of the 
body be processed. I will offer it in two forms: text/enhanced and 
text/html. How do I encode that?

	C-T: multipart/alternative
	C-D: render;handling=required
		C-T: text/enhanced
		C-D: render;handling=optional
		===
		C-T: text/html
		C-D: render;handling=optional
or
	C-T: multipart/alternative
	C-D: render;handling=required
		C-T: text/enhanced
		C-D: render;handling=required
		===
		C-T: text/html
		C-D: render;handling=required

And if I don't support either of those text types, what error do I 
return? 415? In the first case it seems a little odd to return an error 
if I selected a part that is optional.

And if I didn't require either part to be understood, would I just 
change to handling=optional for the multipart/alternative itself?


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