On page 3 near the bottom the following paragraph appears:
In the case of a Multipart/Alternative body part containing
several entities with identical content-IDs the start entity
should be selected using the Multipart/Alternative rules.
This is the only paragraph discussing the use of compound mime
types for the type and start parameters. It is way too terse and
should be expanded. For example can any mime type/subtype be used
for the type parameter (e.g., message/external, image/gif) ?
An example of the use of type="Multipart/Alternative" at the end
of the document, as well as, a discussion of which mime types/subtypes
can and cannot be used for the type parameter will help interoperability
and my understanding of the draft.
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