Re: Grouping in the FAQ (was Re: Conflicting Node Values)
It should already be done (or nearly done). Dave Pawson has contacted me with sample code that he was writing up for inclusion in the FAQ. At least for the Oracle XSLT engine the: generate-id(.) = generate-id(key('tid',.)) is slightly faster because it doesn't have to produce two nodesets to merge and count as does the: count(.|key('tid',.))=1 approach. The latter is definitely shorter and the difference is not night and day (at least on our processor). If Saxon or Xalan have different techniques for merging node lists and counting nodes, perhaps that might tip the benefit in the direction of the count() syntax. Maybe Dave P. can comment on whether the example is ready to rock-n-roll yet... ______________________________________________________________ Steve Muench, Lead XML Evangelist & Consulting Product Manager Business Components for Java & XSQL Servlet Development Teams Oracle Rep to the W3C XSL Working Group ----- Original Message ----- From: "Mike Brown" <mike@xxxxxxxx> To: <xsl-list@xxxxxxxxxxxxxxxx> Sent: Thursday, May 25, 2000 1:48 PM Subject: Grouping in the FAQ (was Re: Conflicting Node Values) | > yes, Mike says he thinks it will be a bit faster | > | > > file://tracker-id[count(.|key('tid',.))=1] | | *boggle* | | So in 2 weeks' time, members of this list have improved the longstanding | preceding/following-based grouping algorithm 3 times, using pure XSLT. | Exciting! | | Does someone want to volunteer to write a test case with examples of the | various methods, to replace the Grouping and Grouping & Sorting sections | of the FAQ? | | - Mike | ___________________________________________________________ | Mike J. Brown, software engineer, Webb Interactive Services | XML/XSL stuff: http://www.skew.org/ http://www.webb.net/ | | | XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list | XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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