On Fri, Nov 2, 2012 at 6:30 AM, Michael Kay <mike(_at_)saxonica(_dot_)com>
wrote:
In some circumstances it would work in the form
not(//Websites/*[count(distinct-values(//Websites/*))+1])
Yes, this is what I meant -- thank's for the correction.
But that solution is more dependent on a smart optimizer than the original,
because a naive engine will reevaluate the predicate once for every node
selected; and the performance of an unoptimized implementation of the
original is still (almost) linear, whereas an unoptimized implementation of
the latter is quadratic.
I believe that it we re-write this in a more specific form then it
wouldn't be so optimizer specific:
not(//Websites/*[position() = count(distinct-values(//Websites/*))+1])
or does this require the same degree of cleverness than the previous
expression does?
Or probably this is even more specific:
not(//Websites/*[position() gt count(distinct-values(//Websites/*))])
--
Cheers,
Dimitre Novatchev
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