<xsl:variable name="var">
<xsl:element name="root">
<xsl:element name="subroot">
<xsl:apply-templates
select="file_entry"/>
</xsl:element>
</xsl:element>
</xsl:variable>
that could more easily be written
<xsl:variable name="var">
<root>
<subroot>
<xsl:apply-templates
select="file_entry"/>
</subroot>
</root>
</xsl:variable>
For your given input, the root element does not have any file_entry
elements so $test is the document
<root><subroot/></root>
Your key matches on subroot elements using the value of ccc, but this
subroot does not have a ccc element so the key returns nothing, asl you
comment.
David
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