XSLT 2.0 allows you to use xsl:sequence
instead of xsl:copy-of, so you can construct a variable
whose value is a
sequence of nodes (node references) without making copies
of the nodes.
Wouldn't I once again have the problem with
preceding::sibling when they are references?
Yes, this doesn't enable you to use preceding-sibling; what it does do is to
enable you to create a variable whose value is a sorted sequence of nodes,
each of which retains its original owner and children, etc, without copying
the nodes; you can then process this sequence using a variety of new XSLT
2.0 and XPath 2.0 constructs that make it unnecessary to use
preceding-sibling.
IIRC correctly, though, your problem was a grouping problem in which case
you can probably solve it directly using XSLT 2.0's for-each-group
construct.
Michael Kay
http://www.saxonica.com/
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