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> I'm > happy with the notion that XML *is* a *syntax*. I don't think > it's really a language, and I'm not sure what a metalanguage > is either. A language for describing the syntax of another language? But actually XML is more than a metalanguage for describing other languages; it's also the class of languages that can be so described. Perhaps the notion of "metalanguage" or "language in which one can define markup languages for documents" is over-emphasising the role of the DTD, when one of the major contributions of XML is to make the DTD optional. Perhaps: "XML is a set of rules defining how the structure of a document can be represented by means of character-based markup inserted into the document text." Regards, Michael Kay http://www.saxonica.com/ http://twitter.com/michaelhkay
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