Subject: RE: [xsl] Filtering XML to improve performance From: "Andrew Welch" <AWelch@xxxxxxxxxxxxxxx> Date: Mon, 22 Mar 2004 09:28:34 -0000 |
> <root> > <items> > <onlyImportantItem>THIS</onlyImportantItem> > <junkItem>foo</junkItem> > <moreJunk>foo</moreJunk> > <stillMoreJunk>foo</stillMoreJunk> > </items> > <items> > <onlyImportantItem>THAT</onlyImportantItem> > <junkItem>foo</junkItem> > <moreJunk>foo</moreJunk> > <stillMoreJunk>foo</stillMoreJunk> > </items> > ... > ... > ... > </root> > > > If I only mainly want to work with <onlyImportantItems>, is > there a way that I can filter out all the other data I don't > need when I do the transform? > > So for instance, I don't want the XML parser searching > through all the garbage, I want it cut down to just the data > I need. Can I do something like this at the beginning of all > my xsl sheets? One way is to use a SAXFilter in java to only 'pass through' the elements you want. That way the xslt processor will only receive a document that looks like: <root> <items> <onlyImportantItem>THIS</onlyImportantItem> </items> <items> <onlyImportantItem>THAT</onlyImportantItem> </items> ... This filtering pretty much costs nothing and you will end up with a much smaller input document, which reduces memory use and increases speed. cheers andrew
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