Subject: Re: [xsl] position() oddity? From: "Steve Muench" <Steve.Muench@xxxxxxxxxx> Date: Wed, 28 Feb 2001 17:27:27 -0800 |
| Given test.xml | | <?xml version="1.0"?> | <?cocoon-process type="xslt"?> | <?xml-stylesheet href="test.xsl" type="text/xsl"?> | <headers> | <title>First</title> | <title>Second</title> | <title>Third</title> | <title>Fourth</title> | <title>Fifth</title> | </headers> | | what would you expect position() in template match "headers/title" to | return? Currently it returns 2 4 6 8 10 using test.xsl (appended) when | run through xt and cocoon. It's not quite what I expected (1 2 3 4 5 :-) Peter, this is expected behavior. Here's why: Quoting the XSLT 1.0 spec: In the absence of a 'select' attribute, the xsl:apply-templates instruction processes all of the children of the current node, including text nodes. So, in your stylesheet, your <xsl:apply-templates/> in your match="headers" template causes the XSLT processor to process all of the children of <headers> *including text nodes*. This includes text nodes that you cannot see, like the text nodes comprised of whitespace that I've made visible below using "#" to represent carriage return and "*" to represent space: <headers># ***<title>First</title># ***<title>Second</title># ***<title>Third</title># ***<title>Fourth</title># ***<title>Fifth</title># </headers> So, the list of children of <headers> viewed linearly looks like this: #*** (text) <title> #*** (text) <title> #*** (text) <title> #*** (text) <title> # As the processor processes each child node, it will match the default rule for the text nodes, and simply output their value to the result tree, and it will "engage" your match="headers/title" template for each <title> element. In the current node list visualized above, these <title> elements are at positions 2, 4, 6, 8 You can avoid this extra whitespace by using: <xsl:strip-space elements="*"/> to strip all text-nodes consisting of only whitespace from the input for all element, or the above in combination with: <xsl:preserve-space elements="some special cases"/> to strip white space from all *but* a space-separated list of elements. ______________________________________________________________ Steve Muench, Lead XML Evangelist & Consulting Product Manager BC4J & XSQL Servlet Development Teams, Oracle Rep to XSL WG Author "Building Oracle XML Applications", O'Reilly http://www.oreilly.com/catalog/orxmlapp/ XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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