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Re: [xml-dev] What class of grammars is an XPath?

> Anyway, it is an interesting question. I think the same question could 
> be asked, rephrased, as "what is the smallest class of formal grammars 
> that every Xpath (evaluating to boolean) belongs to?"

I don't understand the question. There's no grammar that precisely 
describes the set of documents for which the expression

sum(//order/@value) > 826

returns true. It's not a grammatical constraint.

Michael Kay

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