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- Dan's comments are right on the money. As an example of how you can
- treat non-mail-oriented data as being in MIME format, I've recently
- written a script that makes it trivial to set up a MIME-smart mailserver
- daemon for, say, everything in your anonymous ftp directory. This
- script -- which will be part of the next metamail release -- accepts
- mail requests that give path names relative to the anonymous ftp root,
- e.g. "pub/nsb/BodyFormats.txt" and sends the results back as MIME-format
- mail. The neat thing is that the files themselves don't need to be in
- MIME format. The files are assumed to be plain text unless there is a
- ".ct" file (e.g. "pub/nsb/BodyFormats.txt.ct") in which case that file
- is assumed to contain the Content-type information. Thus if you have a
- gif image in file "foo", you can put the text "image/gif" in the file
- "foo.ct" and the mailserver will be ready to send the GIF image as
- MIME-format mail. The script is smart enough, using the metamail tools,
- to deal with any necessary encoding for mail transport, even though the
- raw data is unencoded.
-
- The point is that, as Dan says, the data doesn't need to be explicitly
- in MIME format. MIME body parts are just (possibly encoded) data in
- reasonably standard formats. If you don't enclose it in a mail-ish
- thing with a content-type header field, you need some other
- "out-of-band" way of providing the type information, but this can be
- done in many ways, e.g. the ".ct" files my mailserver uses. Viewed this
- way, all that MIME is really comes down to three things:
-
- 1. A mechanism for encoding arbitrary data for mail transport. This is
- orthogonal to the other parts and can be largely ignored in non-mail
- applications.
-
- 2. A mechanism for combining multiple objects in a "multipart" format
- defined by MIME. This doesn't need to be used by non-mail applications,
- but a common way of doing this has obvious value. Why shouldn't
- multi-media objects be shared across email, wais, gopher, and www?
-
- 3. A naming convention and a set of standard names for describing data
- types such as "image/gif" and "audio/basic". The common naming
- conventions are perhaps the most valuable aspect of MIME for non-mail
- applications, as it is pretty obviously silly to give slightly different
- names to the same things in different systems.
-
- Anyway, as a principle author of MIME I know I'm not in a great position
- to appear to be objective, but I really don't see any good reasons not
- to use MIME in applicaitons such as gopher, wais, or www. -- Nathaniel
-
-