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If element value is a number

File: Data.xml <?xml version="1.0" encoding="utf-8"?> <data>     <number>253</number>     <number>sd12</number>     <number>-64</number>     <number>2.25.25</number>     <number>2.25</number> </data> File: Transform.xslt <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet       version="1.0"       xmlns:xsl="http://www.w3.org/1999/XSL/Transform">     <xsl:template match="number">       <DIV>         <xsl:value-of select="."/>         <xsl:if test="string(number(.))='NaN'"> is not a number</xsl:if>       </DIV>     </xsl:template> </xsl:stylesheet> Output: <?xml version="1.0" encoding="UTF-8"?>     <DIV>253</DIV>     <DIV>sd12 is not a number</DIV>     <DIV>-64</DIV>     <DIV>2.25.25 is not a number</DIV>     <DIV>2.25</DIV>