OK! but when I try
<xsl:key name="ref-titles" match="exsl:node-set($sort-titles)/*"
use="@doc-number"/>
you can't use variables or extension functions in match patterns.
Just use
<xsl:key name="ref-titles" match="*" use="@doc-number"/>
and make sure that the current node is inside the tree generated by
exsl:node-set($sort-titles) when you call key('ref-titles', ...)
key() always returns nodes from the current document.
David
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