Yes, using SGML for this seems fairly non useful, but using MIME as
wrappers can still be useful in the long run. I just think that not
too long from now one of those forms will be "type=audio" :), and when
that happens we'll start to wish we had started with a system with
smarter data block delimeters (ie MIME? don't know MIME too well myself),
rather than having to (again) escape the whole data block.
But a part of me also says to just get this going, and leave MIME
out for now.
-Pei