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How XSLT Works
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XSLT works by applying a series of template rules to the source document tree to produce the result document tree Each template rule consists of two parts: a pattern, which is used to determine which portions of the source tree are affected, and a template, which is used to produce a portion of the output tree The rules are described in a construct called an XML style sheet using XSL (Extensible Style Language) XSL describes how the data contained within an XML document should be presented whether the presentation medium is a web page, handheld device, piece of paper, and so on The style sheet is then associated with the XML document, typically by using the < xml-stylesheet > processing instruction defined in the W3C s XML style sheet specification To see how it all works, let s look at a simple example
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The Document Object Model: Processing Structured Documents
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Consider the following simple XML document:
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< xml version="10" > <hello>Hello there, world!</hello>
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Suppose you had the task of taking this XML document and transforming it into an HTML document that looked like this:
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<HTML> <HEAD> <TITLE>Transformed Document</TITLE> </HEAD> <BODY> <H1>Hello there, world!</H1> </BODY> </HTML>
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In other words, you want the text contained in the <hello> tag to be displayed inside an <H1> tag in the resulting HTML document To perform this in XSLT requires a couple of steps First, you need to define the XSL style sheet that will be responsible for generating the output This means that an HTML document must be created with some kind of holding slot where the <hello> tag s text will go If you name the style sheet helloxsl, in XSL parlance, the style sheet would look like this:
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<xsl:stylesheet xmlns:xsl="http://wwww3org/1999/XSL/Transform"> <xsl:template match="/"> <HTML> <HEAD> <TITLE>Transformed Document</TITLE> </HEAD> <BODY> <H1><xsl:value-of select="hello"/></H1> </BODY> </HTML> </xsl:template> </xsl:stylesheet>
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The <xsl:stylesheet> tag indicates that this file defines an XSL style sheet The <xsl:template> tag defines an XSLT template Its match attribute is an XPath expression indicating what part of the source document this template will
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11: Future Directions for the DOM
match up to The value of / means that the template will be used to match the root element of the source document Contained within the template is some literal HTML code that will be included in the output document, along with the <xsl:value-of> tag This XSLT tag means take the value of the tag that matches my select attribute and insert it here The select attribute uses an XPath expression to determine which node in the source document will supply the value Here, the node is the <hello> tag Now, you need to associate the XSL style sheet file helloxsl with the source XML document This is done by using the < xml-stylesheet > instruction, which looks like this:
< xml-stylesheet type="text/xsl" href="helloxsl" >
The type attribute indicates to the processor that this is an XSL document, and the href attribute contains the relative path to the XSL file In your finished XML document, it all comes together like this:
< xml version="10" > < xml-stylesheet type="text/xsl" href="helloxsl" > <hello>Hello there, world!</hello>
When run through an XSLT processor, the resulting HTML file contains the value of the <hello> tag where the <xsl:value-of> tag was in the XSL file:
<HTML> <HEAD> <TITLE>Transformed Document</TITLE> </HEAD> <BODY> <H1>Hello there, world!</H1> </BODY> </HTML>
Of course, this example shows just a fraction of the capability provided by XSLT For further reading, check out the XSLT specification on the W3C website There are also several good XSLT tutorials on the web; a recent search on the term XSLT Tutorial yielded several good starting points
XSLT Support in Today s Browsers
Both Netscape 6 and Internet Explorer 6 support XSLT, though of the two only IE6 supports programmatically triggering a transformation from within a web page
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