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After perusing comp.text.xml, I was reminded that xml is a proper subset of sgml and thus whence came dtds etc. I guess it would be hard to do away entirely with dtds and retain that relationship. My question was originally prompted by a desire to make provision in (ok, yet another) xml parser (in C++) i'm starting work on for future developments wrt dcd/schema etc. Maybe I can make the dtd parser pluggable. Seems to me that the below idea of something complementing dtds rather then replacing them is a good one. Sincerely, Dave LeBlanc At 01:42 PM 1/19/99 +1100, Rick Jelliffe wrote: > >From: Steven R. Newcomb <srn@t...> > >>The important thing is to go forward, and to avoid going backward, >>with respect to the set of semantics that are expressible using DTDs. > >Personally, I don't think that compatability with what DTDs can model >should be any constraint on a schema language, at least as far as >element >content models. > >The current content model syntax is > * terse > * easy to read and write > * functional for a wide class of documents > * standard and well-understood > * part of XML > * fragment-friendly (SGML's global inclusions and exclusions >have been removed) > >I would much prefer the schema system to assume to existance of a >DTD, and provide the missing parts. For example, > 1) a set of data types for attributes and elements > 2) use XSL patterns to assert that if one pattern is found, >then another pattern must exist. > >The second in particular gets us out of the content-model approach >and into a "partial validation" approach which is more in tune with >namespaces. > >Rick Jelliffe >ricko@g... 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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