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eval xpath expression stored in an attribute

From: Scott Walters <scottw512@-------.--->
To: NULL
Date: 1/6/2005 8:44:00 AM

Is there any way to evaluate an xpath expression that's stored inside an 
attribute of the xml document? In to doc below, there's an xpath in the 
<tmpnode> node.  I try to use it in the <xsl:value-of> but it returns 
the string representation of the xpath, "n1/@ta", instead of evaluating 
it and returning "bkldere".

xml doc...

<doc1>
   <tmpnode relsel="n1/@ta"/>
   <n1 ta="bkldere"/>
</doc1>

xsl...

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:template match="doc1">
       <xsl:variable name="xpvar" select="tmpnode/@relsel"/>
       <xsl:value-of select="$xpvar"/>
    </xsl:template>
</xsl:stylesheet>

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