In XPath 1.0:
==========
number($x) = number($x)
That would also return true if $x is a string or boolean or a node that
can be converted to a number, for example the string "12" or the boolean
true() or an attribute containing the value "12". In fact I think that's
the closest you can get in XPath 1.0 - and it's good enough, because you
don't really want to know whether it IS a number, you want to know
whether it can be used in a context where a number is required.
Michael Kay
Saxonica
In XPath 2.0
==========
Either the above, or:
$x instance of xs:double or $x instance of xs:decimal
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