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Jeni Tennison wrote: > The Datatype Library Language (DTLL) that I've been working on should > eventually provide a declarative method for defining datatypes for > RELAX NG (etc.), but it's at a fairly early stage, and there aren't > any implementations yet. Interesting. Potentially important. One small concern that tickled the back of my head when I read this, though: the target audience. You write, "Most RELAX NG validators provide built-in support for the XML Schema datatype library. Many also support an interface that allows you to plug in datatype modules, written in the programming language of your choice, to define extra datatypes. But the fact that these datatype libraries have to be programmed means that ordinary users find them hard to construct." I can't see "ordinary users" defining their own data types, writing XML by hand to do this, or learning regular expressions as the proposal seems to require. I do think this could be a *very* useful tool for programmers who find it easier to use this language rather than writing their own Java/C# code. Small languages are good. But I would design it with the idea that the people likely to be using it are developers rather than ordinary users and target it at their skills and expectations. I'd rather have a tool powerful to help developers rather than one that's simple enough for end users, if a choice needs to be made between the two. -- Elliotte Rusty Harold elharo@m... XML in a Nutshell 3rd Edition Just Published! http://www.cafeconleche.org/books/xian3/ http://www.amazon.com/exec/obidos/ISBN=0596007647/cafeaulaitA/ref=nosim
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