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File: Data.xml
<shirts>
<shirt colorCode="c4">item 1</shirt>
<shirt colorCode="c1">item 2</shirt>
<shirt colorCode="c6">item 3</shirt>
</shirts>
File: Transform.xslt
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:output method="text" />
<xsl:variable name="colorLookupDoc" select="document('Data.xml')" />
<xsl:key name="colorNumKey" match="color" use="@cid" />
<xsl:template match="shirts">
<xsl:apply-templates select="$colorLookupDoc" />
<xsl:apply-templates />
</xsl:template>
<xsl:template match="colors" />
<xsl:template match="shirt">
<xsl:variable name="shirtColor" select="@colorCode" />
<xsl:for-each select="$colorLookupDoc">
<xsl:value-of select="key('colorNumKey',$shirtColor)" />
</xsl:for-each>
<xsl:text> </xsl:text>
<xsl:apply-templates />
<xsl:text></xsl:text>
</xsl:template>
</xsl:stylesheet>
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