XSL Combining

Many other stylesheets can be imported using xsl:import or been included using xsl:include into the stylesheet. Importing the stylesheet is same as including, except that the definitions and the template rules in importing the stylesheet takes precedence over the template rules and the definitions in a imported stylesheet. The Stylesheet 1 is imported into the Stylesheet 2.

XML source

<?xml version="1.0"?>
<xslTutorial >
<H1>IMPORTING STYLESHEETS</H1>
</xslTutorial>

HTML output 1

IMPORTING STYLESHEETS

XSL stylesheet 1

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:variable name="id2">Stylesheet 1(id2.xsl)</xsl:variable>
<xsl:variable name="t">Variable t from id2.xsl</xsl:variable>
</xsl:stylesheet>

The XSL Templates

An "xsl:import" element children should precede all the other element children of the xsl:stylesheet element, including any of the xsl:include element children. When the xsl:include is been used to include the stylesheet, any of the xsl:import elements in a included document are moved up in a including document to after any of the existing xsl:import elements in a including document.

XML source

<?xml version="1.0"?>
<xslTutorial >
<H1>IMPORTING STYLESHEETS</H1>
</xslTutorial>

HTML output 3

<P>Stylesheet 1(id2.xsl)

XSL stylesheet 2

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:include href="id2.xsl"/>
<xsl:template match="/">
<P><xsl:value-of select="$id2"/></P>
<P><xsl:value-of select="$id3"/></P>
</xsl:template>
</xsl:stylesheet>

The Results of Stylesheet Combining

The Results of combining a stylesheet depends on the position of a xsl:include or the xsl:import function.

XML source

<?xml version="1.0"?>
<xslTutorial >
<AAA/>
<BBB/>
<CCC/>
</xslTutorial>

HTML output 4

<DIV style="color:red">AAA (according to Stylesheet 1 (id2.xsl)</DIV>
<DIV style="color:red">BBB (according to Stylesheet 1 (id2.xsl)</DIV>
<DIV style="color:red">CCC (according to Stylesheet 1 (id2.xsl)</DIV>

XSL stylesheet 4

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="/">
<xsl:apply-templates/ >
</xsl:template>
<xsl:template match="/*/*">
<DIV style="color:blue">
<xsl:value-of select="name()"/>
<xsl:text> (according to this stylesheet)</xsl:text>
</DIV>
</xsl:template>
<xsl:include href="id2.xsl"/>
</xsl:stylesheet>

Apply-Import Function

You can do use the xsl:apply-imports element to get the information from the imported template, whose behaviour are been changing. The Stylesheet 2 imports the Stylesheet 1 and it overrides the template.

XML source

<?xml version="1.0"?>
<xslTutorial >
<AAA/>
<BBB/>
<CCC/>
</xslTutorial>

HTML output 1

<DIV style="color:red">AAA</DIV>
<DIV style="color:red">BBB</DIV>
<DIV style="color:red">CCC</DIV>

XSL stylesheet 1

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="/*/*">
<DIV style="color:red">
<xsl:value-of select="name()"/>
</DIV>
</xsl:template>
</xsl:stylesheet>

Overrides

The Stylesheet 2 imports the Stylesheet 1 and overrides the template.

XML source

<?xml version="1.0"?>
<xslTutorial >
<AAA/>
<BBB/>
<CCC/>
</xslTutorial>

HTML output 2

<EM>AAA</EM>
<EM>BBB</EM>
<EM>CCC</EM>

XSL stylesheet 2

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:import href="id2.xsl"/>
<xsl:template match="/*/*">
<EM>
<xsl:value-of select="name()"/>
</EM>
</xsl:template>
</xsl:stylesheet>

Import Precedence

The Import precedence is more important than the priority precedence. Look at the Stylesheet 2.

XML source

<?xml version="1.0"?>
<xslTutorial >
<AAA id='a1' pos='start'>
<BBB id='b1'/>
<BBB id='b2'/>
</AAA>
<AAA id='a2'>
<BBB id='b3'/>
<BBB id='b4'/>
<CCC id='c1'>
<CCC id='c2'/>
</CCC>
<BBB id='b5'>
<CCC id='c3'/>
</BBB>
</AAA>
</xslTutorial>

HTML output 1

<H3 style="color:blue">CCC (id=c1)</H3>
<H3 style="color:blue">CCC (id=c2)</H3>
<H3 style="color:blue">CCC (id=c3)</H3>

HTML output 2

XSL stylesheet 1

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="/">
<xsl:apply-templates select="//CCC"/>
</xsl:template>
<xsl:template match="CCC" priority="10">
<H3 style="color:blue">
<xsl:value-of select="name()"/>
<xsl:text> (id=</xsl:text>
<xsl:value-of select="@id"/>
<xsl:text> )</xsl:text>
</H3>
</xsl:template>
</xsl:stylesheet>

XSL stylesheet 2

<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:import href="id2.xsl"/>
<xsl:template match="/">
<xsl:apply-templates select="//CCC"/>
</xsl:template>
<xsl:template match="CCC" priority="-100">
<H3 style="color:red">
<xsl:value-of select="name()"/>
<xsl:text> (id=</xsl:text>
<xsl:value-of select="@id"/>
<xsl:text> )</xsl:text>
</H3>
</xsl:template>
</xsl:stylesheet>

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