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   Re: Ambiguity in XML spec

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  • From: Steve Schafer <pandeng@telepath.com>
  • To: xml-dev@xml.org
  • Date: Fri, 19 May 2000 09:59:03 -0500

On 19 May 2000 13:09:24 GMT, richard@cogsci.ed.ac.uk (Richard Tobin)

>The grammar in the spec describes the language correctly, and the
>productions in question can be used directly with compiler-generators
>like yacc.

That's simply not true. yacc generates parsers for LALR(1) grammars,
and the grammar in the XML spec is not LALR(1), unless, as I mentioned
earlier, you omit at least some of the regular expression-based

If you _do_ omit those productions, then you need to have a lexical
analyzer that can handle them, and there is no _single_ lexical
analyzer that can handle all of them, because the rules for
tokenization are strongly dependent on context.

-Steve Schafer

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