Re: More on notations and MIME types
At 02:53 PM 12/3/98 -0500, John Cowan wrote: >Here's my potted version of notations vs. MIME types: > > Both provide names for syntactic encodings. > > Notations have local names (private aliases), > whereas MIME types don't. > > MIME type names have internal syntax, allowing partial > interpretation; notation names are opaque. But you can get the same effect with data ("notation") attributes (or you could, if XML had included them.). Also, the SGML Extended facilities, we formalized a mechanism for establishing notation hierarchies so that one notation can name another notation as its supertype. More verbose than the MIME mechanism, but I think ultimately more flexible. Again, depends on data attributes. Here, I think, it comes down to syntax choices. Any syntax defined for compactness will almost always be limited in some key way. And of course, you can combine notations with MIME types to take advantage of the MIME facilities, if you want to (by making the MIME type the external ID of the notation, directly or indirectly). > MIME types reference a central registry with private-use > extensions; notations reference a distributed registry. But notations can use any central registry that exists, including the MIME registry. If we had a generally available public ID or URN registry, it wouldn't even be an issue. I observe that part of the issue here seems to be the need to have reliable public registries for persistently-named resources, which is a general problem. MIME type names are persistent names--if there existed a general-purpose registry of persistent names, then MIME type names wouldn't need their own special-purpose registry (which obviously they had to have in order to make MIME work at all). Cheers, E. -- <Address HyTime=bibloc> W. Eliot Kimber, Senior Consulting SGML Engineer ISOGEN International Corp. 2200 N. Lamar St., Suite 230, Dallas, TX 75202. 214.953.0004 www.isogen.com </Address> xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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