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(:**************************************************************:)
(: Test: functx-functx-is-a-number-all :)
(: Written by: Priscilla Walmsley (Frans Englich is maintainer) :)
(: Date: 2008-05-16+02:00 :)
(:**************************************************************:)
declare namespace functx = "http://www.example.com/";
(:~
: Whether a value is numeric
:
: @author Priscilla Walmsley, Datypic
: @version 1.0
: @see http://www.xqueryfunctions.com/xq/functx_is-a-number.html
: @param $value the value to test
:)
declare function functx:is-a-number
( $value as xs:anyAtomicType? ) as xs:boolean {
string(number($value)) != 'NaN'
} ;
let $in-xml := <in-xml>
<a>123</a>
<b>abc</b>
</in-xml>
return (functx:is-a-number('123'), functx:is-a-number(123), functx:is-a-number(' 123 '), functx:is-a-number(''), functx:is-a-number('123abc'), functx:is-a-number('NaN'), functx:is-a-number($in-xml/a), functx:is-a-number($in-xml/b))
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