Re: xsl:key

Keys offer another kind of flexibility that may be useful in a
few situations: the keyed items can be located at irregular places
in the tree. When David Carlisle says:
>Like id, key is replaceable by some construction selecting
>nodes based on an XPath expression, so you just have to trust that
>the implementors implement it at least no less efficiently
>than that.
...that's certainly a good point, but you won't always have the
alternative of an XPath expression, short of a humongous union.

More concretely, Mike French suggests that
<xsl:apply-templates
select="document('bib.xml')//entry[@name = $name]"/>
might work as an alternative to
...select="key('bib',$name)"
but that's only possible if every 'entry' of interest is two levels
down. There may be situations where that's not the case.
.................David Marston


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