XSL Introduction

With the XSL you can freely do modify any of the source text. Stylesheet 1 and the Stylesheet 2 produces the different output from a same source file.

XSL stylesheet 1

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform' >

<xsl:template match="/">
<H1><xsl:value-of select="//title"/></H1>
<H2><xsl:value-of select="//author"/></H2>
</xsl:template>
</xsl:stylesheet>

XSL stylesheet 2

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform' >

<xsl:template match="/">
<H2><xsl:value-of select="//author"/></H2>
<H1><xsl:value-of select="//title"/></H1>
</xsl:template>
</xsl:stylesheet>

An XML Syntax

An every XSL stylesheet should start with the xsl:stylesheet element. Atribute xmlns:xsl specifies the version of the XSL(T) specification. This example do show simplest possible stylesheet. As it do not contains any of the information, a default processing is been used.

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform' >

</xsl:stylesheet>

An XSL Processor

The XSL processors parses the XML source and tries to find out the matching template rule. If it do find it, then the instructions inside the matching template are been evaluated.

Contents of the original elements can be recovered from a original sources in two basic ways. A Stylesheet 1 uses the xsl:value-of a construct. In this case contents of the element is been used without any further processing. Construct an xsl:apply-templates in the Stylesheet 2 is different. The parser further processes the selected elements, for which the template is been defined..

XSL stylesheet 1

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

<xsl:template match="employee">
<B><xsl:value-of select="."/></B>
</xsl:template>
<xsl:template match="surname">
<i><xsl:value-of select="."/></i>
</xsl:template>
</xsl:stylesheet>

XSL stylesheet 2

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform' >

<xsl:template match="employee">
<B><xsl:apply-templates select="firstName"/></B>
<B><xsl:apply-templates select="surname"/></B>
</xsl:template>

<xsl:template match="surname">
<i> <xsl:value-of select="."/></i>
</xsl:template>
</xsl:stylesheet>

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