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That would also return true if $x is a string or boolean or a node that can be converted to a number, for example the string "12" or the boolean true() or an attribute containing the value "12". In fact I think that's the closest you can get in XPath 1.0 - and it's good enough, because you don't really want to know whether it IS a number, you want to know whether it can be used in a context where a number is required.
Re: [xsl] How do I determine that an item is a numeric atomic value?
Subject: Re: [xsl] How do I determine that an item is a numeric atomic value? From: Michael Kay <mike@xxxxxxxxxxxx> Date: Sat, 02 Oct 2010 22:55:47 +0100 |
In XPath 1.0: ==========
number($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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