Michael Kay
Saxonica
mike(_at_)saxonica(_dot_)com
+44 (0118) 946 5893
On 6 Jul 2014, at 20:01, Dimitre Novatchev dnovatchev(_at_)gmail(_dot_)com
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
<xsl:if test="following-sibling::Book[Title eq $currentAuthor][Genre eq
$currentGenre][1]">
Why not the obviously more-efficient -- especially for a naive
processor that you describe -- code:
following-sibling::Book[Title eq $currentAuthor and Genre eq
$currentGenre][1]
I can't see why that's obviously more efficient. They look identical to me.
or probably even better (as a hint to the optimizer):
exists(head(following-sibling::Book[Title eq $currentAuthor and
Genre eq $currentGenre]))
Again, it's still quadratic performance if your evaluate this for every Book.
Michael Kay
Saxonica
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