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Re: [xsl] XPath perfomance in attributes or nodes?
Subject: Re: [xsl] XPath perfomance in attributes or nodes? From: "Jonathan Perret" <jonathan@xxxxxxxxxxxx> Date: Thu, 7 Mar 2002 10:45:18 +0100 |
I would like to ask the XSLT implementors on this list whether their processors build keys lazily (i.e. on the first use of the key() function), or does <xsl:key> have a cost even when the key is not used later ? When is the cost of building the index offset by the performance gain ? For example, suppose the input is 10000 elements like so : <doc> <elt att="1"> </elt> <elt att="2"> </elt> <elt att="3"> </elt> ... </doc> and there is an external parameter that gives the stylesheet an attribute value to look for. Which would be faster : <xsl:key name="idx" match="elt" use="@att" /> <xsl:param name="param" /> <xsl:template ...> ... <xsl:apply-templates select="key('idx',$param)" /> ... </xsl:template> Or : <xsl:param name="param" /> <xsl:template ...> ... <xsl:apply-templates select="/doc/elt[@att=$param]" /> ... </xsl:template> Assuming the <xsl:apply-templates> above is executed only once, it seems to me that the key-less version should perform a bit faster. But as I have never implemented an XSLT processor I would like to have the opinion of masters of the subject. Cheers, --Jonathan ----- Original Message ----- From: "Peter Davis" <pdavis152@xxxxxxxxx> To: <xsl-list@xxxxxxxxxxxxxxxxxxxxxx> Sent: Thursday, March 07, 2002 3:52 AM Subject: Re: [xsl] XPath perfomance in attributes or nodes? > <xsl:key name="project-uid" match="project" use="@uid"/> > <!-- or use="uid" --> > <xsl:template ...> > <xsl:apply-templates select="key('project-uid', > '{6A97F258-93A7-4C5E-B712-052130A5208C}')[1]"/> > <!-- [1] is probably not necessary --> > </xsl:template> > > will be much faster than either approach. > XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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