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Michael Kay wrote:
> > 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.
>
You could use a sequence (of numbers and delimter/operator strings) and
eval it. You could then do symbolic simplifications
( $a /$b ) + ( $c /$b ) -> ($a + $c) /$b
$x / 1 -> $x
It would be simpler in real LISP (can XPath sequences contain
sequences?) but the same kind of thing.
Cheers
Rick
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