if the fragment represents part of a message that contained a body, can the fragment contain just a portion of the body?
(I've generalized this - the actual question was whether the fragment could contain a Content-Type:application/sdp, and then contain just a portion of the actual sdp - a portion that was not syntactically correct SDP.)
Based on my reading of rfc 3420, I think the answer is NO. But it does raise the question whether the answer (to the generalized question) *should* be YES. I'm undecided on this, and would like to hear other opinions, but I am inclined to be pretty lenient.
In part there is an uncertainty principle here. How would you be able to tell a valid usage from an invalid one? Sipfrag is often used to relay messages received from others. It is possible that those received messages were ill-formed. In that case, a sipfrag that conveys the ill-formed message could appear identical to one that was obtained by invalid subsetting from a valid message. If you can't tell the difference, why ban the practice?
Another reason is that there may be increasing reason to subset the body when building a sipfrag. For instance, the original message may have had a large multipart body. But for purposes of the sipfrag only one of the parts is significant.
Paul
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