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Re: [xml-dev] Registration status
From: Ian Graham <email@example.com>
Subject: Re: [xml-dev] Registration status
Date: Thu, 15 Nov 2001 18:49:00 -0500 (EST)
> Any thoughts?
It is not clear to me how your proposal solves problems
described in Appendix A (especially, A.5) of RFC 3023.
> A.5 Why not use a MIME parameter to specify that a media type uses XML
> For example, one could use "Content-Type: application/iotp;
> alternate-type=text/xml" or "Content-Type: application/iotp;
> Section 5 of [RFC2045] says that "Parameters are modifiers of the
> media subtype, and as such do not fundamentally affect the nature of
> the content". However, all XML-based media types are by their nature
> always XML. Parameters, as they have been defined in the MIME
> architecture, are never invariant across all instantiations of a
> media type.
> More practically, very few if any MIME dispatchers and other MIME
> agents support dispatching off of a parameter. While MIME agents on
> the receiving side will need to be updated in either case to support
> (or fall back to) generic XML processing, it has been suggested that
> it is easier to implement this functionality when acting off of the
> media type rather than a parameter. More important, sending agents
> require no update to properly tag an image as "image/svg+xml", but
> few if any sending agents currently support always tagging certain
> content types with a parameter.