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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Must DTDs constrain order?
 Tim Bray wrote: > > At 07:36 PM 27/10/00 -0700, Wayne Steele wrote: > > >I have had to deal with this frequently. > >Here are several choices I've made at different times: > > Here's another one. Since you're going to have to write > some code anyhow to validate against business rules, just > put the content check in there and don't waste your time > trying to make DTDs do things that aren't cost-effective. Yes, this is probably the way to go... I begin to think that XML vocabularies should take example on XML itself and that when designing a vocabulary one should start by defining the infoset (the data model), a canonical form (a very strict syntax) before defining one (or more if needed) "user XML syntax(es)" and canonization algorithms with reference implementation(s). In this case, the canonization process would include elements ordering. It can also include business algorithm as Tim mentioned. The canonical form being very strict, the canonical algorithm could also include namespace filtering and prefix rewriting allowing things like DTD validation of modular multi-namespace XML documents or generation of semantic (RDF or XLink) metadata. (Such a process would also facilitate "namespace migration" as recently discussed on this list about href vs xlink:href or style vs a potential css:style.) Eric > -Tim -- ------------------------------------------------------------------------ Eric van der Vlist Dyomedea http://dyomedea.com http://xmlfr.org http://4xt.org http://ducotede.com ------------------------------------------------------------------------ 
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