Subject: Re: [xsl] Benefits of using xsl:key From: Jesper Tverskov <jesper.tverskov@xxxxxxxxx> Date: Wed, 4 Nov 2009 20:22:20 +0100 |
I have made a more realistic input file, but it leads to new results reminding me of my first statement: It is difficult to create a test example showing that xsl:key can speed up the transformation. In the original example, three elements were copied and pasted over and over again to create a file of 3000 lines. This gave an input file with only two elements having different content. The speed difference in usig xsl:key or not was close to 1:100. (10s/0.1s). I have now made a new input file. I transformed the original input fil to a new input file making all the id attribute values unique, and also all the content unique. I then hand edited the new file for 15 of the elements, making the content the same for some other element. The transformation with Saxon HE, PE and EE without using xsl:key is now much faster, 4.5s, but, as a big surprise (to me), the use of xsl:key has no influence on the transformation speed still being 4.5s, and also the optimization option in EE has no effect! I'm a little confused. My conclusion is that xsl:key can make a transformation faster in some situations. It very much depends on data. Question: What is the rule of thumb for data sets where the use of xsl:key is likely to make a big difference? Cheers, Jesper
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