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- > The arguments that in-band designation of document format is better
- > than out-of-band information may apply in the electronic mail
- > scenarios, where there is a single sender, multiple recipients, and
- > the recipient has no control over what the sender might send.
-
- The argument is identical for most file servers, which have even less control
- over the specifics of what files they offer for retrieval. File servers usually
- rely on contributed material and only rarely have anything resembling precise
- control over the material they offer.
-
- > Instead, imagine, if you would, another scenario, of a WAIS or Web or
- > anonymous FTP archive, which wishes to make available the latest
- > version of the MIME specification. Let us suppose, in addition, that
- > the publishing service has three different representations of the
- > document, one marked "MIME rich-text", one marked "postscript", and
- > one NetFax. Furthermore, let us suppose (as has been proposed) that
- > the document types are marked by their MIME Content-type header
- > designation.
-
- Nothing wrong with this.
-
- > If I wish to retrieve the document, say to view it, I might want to
- > choose the available representation that is most appropriate for my
- > purpose. Imagine my dismay to retrieve a 50 megabyte postscript file
- > from an anonymous FTP archive, only to discover that it is in the
- > newly announced Postscript level 4 format, or to try to edit it only
- > to discover that it is in the (upwardly compatible but not parsable by
- > my client) version 44 of Rich Text. In each case, the appropriateness
- > of alternate sources and representations of a document would depend on
- > information that is currently only available in-band.
-
- Even if this happens (I have strong doubts that it will since documents made
- available for public retrieval tend to converge rapidly to lowest-common
- denominator usage) you have failed to propose an alternative that solves this
- usefully.
-
- > I believe that MIME was developed in the context of electronic mail,
- > but that the usage patterns in space and time of archives, database
- > services and the like require more careful attention (a) to
- > out-of-band information about format versions, so that you might know,
- > before you retrieve a representation, whether you have the capability
- > of coping with it, and (b) some restriction on those formats which
- > might otherwise be uncontrollable.
-
- And I disagree. You still have failed to explain how to overcome any of my
- objections to this approach.
-
- > Finally, as much as I've tried to resist, I'll characterize your
- > description of my response as 'repeated failure on your part to read
- > the words I was writing' as 'inflammatory hogwash'.
-
- Well, you're doing it again. You have failed to explain you intend to overcome
- any of the obstacles I've pointed out, precisely as if you have not bothered to
- read any of my previous response. Since one of them is the halting problem in
- disguise your method of overcoming it (assuming you have one) will be the
- computing news of the century.
-
- I have no intention of answering any further mail from you until you come
- to grips with the objections I have laid out for about the tenth time.
-
- Finally, let me point out that I speak as one of the maintainers of one of the
- largest archive of TeX material available anywhere. This material has been
- available via MIME-compliant mail server (and of course FTP) for over six
- months now. This archive contains hundreds of PostScript documents as well
- as all sorts of other stuff. The problems you seem to think are endemic to
- this sort of services have yet to materialize.
-
- Ned
-
-