It might have been a string that is the string
representation of a number:
"3.1415" (is a string)
but this is completely different from:
3.1415 (is a number).
What will really be useful is a function with an argument of item(),
that returns the real type of the argument.
Or go back to my original suggestion, which was to use
if ($x castable as xs:decimal) ...
Michael Kay
http://www.saxonica.com/
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