Re: xsl:key on variable containing result of apply-tem

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:saxon="http://icl.com/saxon"
xmlns:exsl="http://exslt.org/common"
extension-element-prefixes="exsl saxon">

<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
	
<xsl:key name="alphabetKey" match="newAlphabet" use="@col"/>
<xsl:variable name="alphabet">
	<xsl:apply-templates select="/test/alphabetList/alphabet"  mode="loadList"/>
</xsl:variable>
<xsl:variable name="alphabet-exslNodeSet" select="exsl:node-set($alphabet)"/>

<xsl:template match="numbers">
   <xsl:for-each select="number">
     <xsl:variable name="curPosition" select="position()"/>
     <xsl:for-each select="$alphabet-exslNodeSet">
       <!-- NB context changed to converted node set -->
       <xsl:copy-of select="key('alphabetKey', $curPosition)"/>
     </xsl:for-each>
   </xsl:for-each>
</xsl:template>

<xsl:template match="/">
   <xsl:apply-templates select="test/numbers"/>
</xsl:template>

<xsl:template match="alphabet" mode="loadList">
	<newAlphabet col="{@col}"><xsl:value-of select="."/></newAlphabet>
</xsl:template>