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Re: [xsl] following-sibling is evil

Subject: Re: [xsl] following-sibling is evil
From: "Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Sun, 6 Jul 2014 19:00:44 -0000

> <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

or probably even better (as a hint to the optimizer):

    exists(head(following-sibling::Book[Title eq $currentAuthor and
Genre eq $currentGenre]))

Certainly, using keys would give us a superior performance, if a more
than one similar expression is evaluated.

Dimitre Novatchev
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