<xsl:copy-of (or apply-templates, depending on what you want)
select="/article/answer[(_at_)ref=current()/@id]"/>
If the ref attribute is of declared in a DTD to be of type ID it's
simpler
select="id(@ref)
but I guess that isn't the case.
You could use keys to speed up the first form
declare a key
<xsl:key name="ans" match="answer" use="@ref"/>
then you can use
<xsl:copy-of (or apply-templates, depending on what you want)
select="key('ans',@id)"/>
which is equivalent to the first but may be faster (well that bit is
almost certainly faster but you pay the price of building the key table
in memory which takes time and space so it depends a lot on the size of
the document and how often you are doing the lookup)
David
--
http://www.dcarlisle.demon.co.uk/matthew
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