Subject: Re: [xsl] XSL: For-Each Efficient or Not? From: Kevin Jones <kjjones@xxxxxxxxxxxx> Date: Mon, 1 Jul 2002 16:15:40 +0000 |
On Monday 01 Jul 2002 2:32 pm, Michael Kay wrote: > > We have been trying to determine whether using XSL:For-Each > > is having an impact on the speed of our document publishing. > > Some of my buddies don't want to use xsl:for-each because > > they believe it causes the process to take a longer amount of > > time than just doing a template match over and over. Is this > > true or no? Is xsl:for-each a performance hog or does it and > > template matching take the same amount of time? > > Measure it and see. The results will depend on which XSLT processor you > are using. My guess is that there will be very little difference. The > arguments against xsl:for-each are based on maintainability, not on > performance. > And the complexity of the template match expressions in the stylesheets. Simple tests on name or nodetype can be efficient but matches that involve predicates are generally harder for a processor to index. These can cause some processors to use sequential searching for a templates (slow for large numbers of templates). I have seen the performance of some stylesheets completely cripled by use of complex matches, e.g., <xsl:template match="m:apply[child::*[position()=1 and name()='factorof']]"> So its very specific to a processor/stylesheet pair and complex tests are better done in for-each/if blocks if performance is more important than maintainability. Kev. XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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