Re: [xsl] following-sibling is evil

["Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

> <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]

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.


-- 
Cheers,
Dimitre Novatchev
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