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From: "Paul T" <pault12@p...> > I've asked only *one* question, which is "what is RDDL for, > what is the real-life project you would use for?" and I got > no friggin answer, just stupid jokes. The documentation at the end of Schematron's namespace[1] is a RDDL document. We want something rather than nothing at the namespace URI's resource, and we don't want specific schemas, because the same elements may be combined in different ways legitimately (e.g. a subset of XHTML should still use elements from the XHTML namespace): the namespace is primarily about general semantics, and most schemas are unnecessarily strict. In DZIP [2] a.k.a XAR, we define a ZIP archive and naming conventions for document application information. It is very appropriate if a RDDL file is used as the .html file in the root to give documentation. When SAX parser developers start building catalogs and RDDL support as part of their base product, then RDDL can become useful. Until then, people have to support RDDL product-by-product, which is not good for getting network effect. But the more languages defined using RDDL, the better the groundwork will be laid for automated processing. ISO DSDL, mentioned on the list recently, aims to go one step beyond RDDL, in one sense. It aims to provide a processing chain for schema and augmentation systems (e.g. perhaps even to be able express things like "I want to validate my document using RELAX NG with W3C Schemas datatypes, then run it through a Regular Fragmentations converter and then a Schematron validation, then convert the RELAX schema to a W3C XML Schema and generate the appropriate PSVI.") That is a particularly hairy example, but the idea, as I understand it, is that to allow schema language modularity (i.e. to fight the "one-schema-language -should-fit-all" bloat) we need to provide not only a way to specify and group the schemas, but also their processing inter-dependencies. Cheers Rick Jelliffe [1] http://www.ascc.net/xml/schematron [2] http://www.topologi.com/public/dzip.html
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