RE: Addition/Subtraction of numbers.

> I have the understanding that the XPath number() function
> will return the string 'NaN' if the parameter passed in is
> not a number. Though, at a lower level, won't the same
> function called twice with identical parameter(s) return the
> same thing? So, when would your test of "number($t1) =
> number($t1)" fail?

When number($t1) is NaN, because (as defined in the IEEE standard) NaN=NaN
is false.

Mike Kay


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