]  <xsl:if test = "number() = NaN"/>
]   sort of thing?


<xsl:template match="a">
<xsl:value-of select="."/> 
<xsl:if test= "string(number(.))='NaN'"> is not a number</xsl:if>
</xsl:template>



 gg  is not a number
 11 
 2 
 3.5 
 xxx  is not a number


David


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