Subject: Re: [xsl] following-sibling is evil From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Sun, 6 Jul 2014 19:39:54 -0000 |
Michael Kay Saxonica mike@xxxxxxxxxxxx +44 (0118) 946 5893 On 6 Jul 2014, at 20:01, Dimitre Novatchev dnovatchev@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> 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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