It is not matching the key in the for-each.
given no indication of the source file, it's hard to guess what should
and should not match any particular pattern.
<xsl:variable name="start" select="concat('SP100',' ','File
CopyBook')"/>
is the same as
<xsl:variable name="start" select="'SP100 File CopyBook')"/>
and so
<xsl:for-each select="key('GROUPowner',$start)">
will select all the GROUP nodes with that key.
But whether or not there are any such nodes, only you can say.
Maybe it is a white space problem. From your example you seem to be
using a space as the separator between the values in your key but also
have a space (from normalising the line end in an attribute value)
in the key component "File CopyBook". This seems a bit dangerous.
David
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