Subject: Re: [xsl] Multiple elements condition From: David Carlisle <davidc@xxxxxxxxx> Date: Thu, 30 Aug 2007 22:23:13 +0100 |
> exists(para[2]) and not(exists(para[3])) > > or > > exists(para[2]) and empty(para[3]) they both always look for the 2nd and 3rd element but you don't need t0 look for the 3rd if the 2nd isn't there.... if (para[2]) then empty(para[3]) else false() but the chance that any of these make a measurable difference is slim, Although the original versions with count() could be noticably slower if the system doesn't rewrite it away. same is true in theory for these of course. According to the spec one might expect that para[1] is just as likely to access all 10000 para elements (and then filter out all but the first) as count(para)=1. But it's probbaly more likely that numeric filters are optimised. David ________________________________________________________________________ The Numerical Algorithms Group Ltd is a company registered in England and Wales with company number 1249803. The registered office is: Wilkinson House, Jordan Hill Road, Oxford OX2 8DR, United Kingdom. This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. ________________________________________________________________________
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