[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Rick Jelliffe quotable quote on the purpose of schemas
> "The flaw with grammars is that they only allow to constraint > content models in a declarative manner There's nothing wrong with constraints being declarative - in fact, they definitely should be - the flaw is with the expressive power of a grammar as a contraint language. This is all well known. And in fact, XML Schema itself has some extra-grammatical constraints, namely uniqueness and referential constraints. But there's still a camp that believes (wrongly, in my view) that the expressive power of a schema language should be restricted for performance reasons. Michael Kay http://www.saxonica.com/
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