That was my knee-jerk reaction, until I realized that EVERY method needs to address the issue. All body-handling can do is give guidance.

One approach is to bastardize Content-Disposition to mean Body-Part- Context, in the vein of Message-Context for e-mail (RFC 3458). Body- handling would specify generic SIP stacks to be aware that Content- Disposition is how you pair a body part with its intended use. Hope no one else wants Content-Disposition: render for anything else...

Another approach is to mandate Content-ID, and give guidance to writers of extensions that add body parts to explicitly state how to address the relevant body part.

So, one thing is clear: we really screwed up by trying to hack Message- Context into Content-Disposition. Mea Culpa for not noticing it sooner.

On Dec 1, 2008, at 7:04 PM, Dean Willis wrote:


Hadriel said:

This "problem" already exists for current SIP messages, and it's up
to the new extensions that add body-parts to solve it in a
backward-compatible way for all message methods.  We don't need to
solve it specifically for INFO.

Hadriel has a point here.

We know that EVERY SIP usage where we end up with two or more
attachments is going to have the attachment-selection problem, aka
"which attachment goes with which extension?"

This isn't just a problem for new work; it's potentially a problem for
several old or ongoing bits of work that result in the potential for
multiple attachments.

Perhaps we should solve this universally in the body handling draft?

--
Dean

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