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RE: [xml-dev] Formulas in XML values

 > I wouldn't say that XPath can't perform rational arithmetic but rather that rational arithmetic is not yet implemented for XPath. 
XPath does not have an atomic data type that is capable of representing the value 1/3 accurately. You could of course do it all using extension functions, but then it wouldn't really be XPath, just XPath calling out to something else.

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