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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: DTDs, W3C Schemas, RELAX NG, Schematron?
 Great summation! > In any of these cases, as soon as one needs > stronger datatyping, say types for integers, > one has to get beyond DTDs. Think of DTDs as > XML's bottom line bootstrapping language for > moving beyond well-formedness, and that is > a good metric, but it won't go very far > and one will likely have to if one needs > a sharable definition that side of > sharing the code. But remember, XML > only requires well-formedness to be > XML and sharing code is not out of the > question. Again, thanks. --- "Bullard, Claude L (Len)" <clbullar@i...> wrote: > As Betty said, "it depends on the tools" is one > rule of thumb. DTDs refuse to go away because > they are ultimately the bottom line of the > XML specification for basic validation. In > other words, you can usually count on them being > supported in your toolset. But given a toolset > that supports RELAX NG, I wouldn't start there > these days. Given a toolset that supports XML > Schema and a need to model, say a relational > database, I would start with XML Schema because > I can get a first cut using an ODBC-sourced > dump of the relational schema. I haven't tried > that with RELAX so I don't know how well that > works but I suspect it does. > > But now I have this table-sourced XML and > I have to model relational value constraints. > At that point, I have to go to Schematron > say in the app-info elements, or I have to > move on to business logic in say C# or > Java objects. > > In any of these cases, as soon as one needs > stronger datatyping, say types for integers, > one has to get beyond DTDs. Think of DTDs as > XML's bottom line bootstrapping language for > moving beyond well-formedness, and that is > a good metric, but it won't go very far > and one will likely have to if one needs > a sharable definition that side of > sharing the code. But remember, XML > only requires well-formedness to be > XML and sharing code is not out of the > question. > > len > > -----Original Message----- > From: tariq abdur-rahim > [mailto:ecliptoid330@y...] > > Interesting point! However, would the argument now, > not be that, given the realative "weakness" of DTDs > in > comparison to Schemas, RELAX NG, and Schematron, > what > would the purpose be of even going the DTD route for > validation? Too, given the example stated... ===== >=>=>=>=>=>=>=>=>=>=>=>=> T. A b d u r - R a h i m W e b D e v e l o p e r More sacrifice, creates better living. __________________________________________________ Do You Yahoo!? LAUNCH - Your Yahoo! Music Experience http://launch.yahoo.com 
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