#4 Optimise xsl:key match pattern

open
nobody
None
3
2012-10-08
2002-01-28
Michael Kay
No

Where the match pattern in xsl:key takes the form of
an absolute path expression (e.g. /a/b/c) it should be
evaluated as an expression to find all the nodes that
need to be indexed, rather than testing every node in
the document to see if it matches the pattern.

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