Subject: Re: [xsl] union vs. "or" vs. contains? From: David Carlisle <davidc@xxxxxxxxx> Date: Tue, 19 Oct 2004 12:21:44 +0100 |
Is this to avoid repeating it on multiple templates? In my case, the conditional statements only occur on a single template in each class. I think it's clearer for anyone reading the stylesheet and (until Mike posts in 10 minutes saying he's added optimisation code to saxon so that both forms produce the same internal code) it is more efficient as if you do the test up at the apply-templates then if it's false you are done and can get on with something else, but if you put the test on the match pattern and it's false then on _every_ node to which templates are potentially going to be applied, you will first have to decide which is the highest priority matching template which will at some point mean looking at that template and evaluating the predicate to false (again) and then finding the next matching template. So even if there is only one template involved it's a lot more work for the system: if you apply templates to an element with 1000 children in one case you do one boolean test then skip the whole process, in the other you do the test and the rest of the template matching process 1000 times. David ________________________________________________________________________ This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________
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