With modes an element can be processed multiple times, each time producing a different result. : template « XSLT stylesheet « XML Tutorial

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2. XSLT stylesheet
3. template

In <stylesheet id="id3"/> one of the modes does not exist.

File: Data.xml

<?xml version="1.0" encoding="utf-8"?>
<data>
    <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>
</data>

File: Transform.xslt

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet
      version="1.0"
      xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:template match="/">
      <xsl:apply-templates select="//CCC" mode="red"/>
      <xsl:apply-templates select="//CCC" mode="blue"/>
      <xsl:apply-templates select="//CCC"/>
    </xsl:template>
    <xsl:template match="CCC" mode="red">
      <div style="color:red">
        <xsl:value-of select="name()"/>
        <xsl:text> id=</xsl:text>
        <xsl:value-of select="@id"/>
      </div>
    </xsl:template>
    <xsl:template match="CCC" mode="blue">
      <div style="color:blue">
        <xsl:value-of select="name()"/>
        <xsl:text> id=</xsl:text>
        <xsl:value-of select="@id"/>
      </div>
    </xsl:template>
    <xsl:template match="CCC">
      <div style="color:purple">
        <xsl:value-of select="name()"/>
        <xsl:text> id=</xsl:text>
        <xsl:value-of select="@id"/>
      </div>
    </xsl:template>
</xsl:stylesheet>

Output:

<?xml version="1.0" encoding="UTF-8"?><div style="color:red">CCC id=c1</div><div style="color:red">CCC id=c2</div><div style="color:red">CCC id=c3</div><div style="color:blue">CCC id=c1</div><div style="color:blue">CCC id=c2</div><div style="color:blue">CCC id=c3</div><div style="color:purple">CCC id=c1</div><div style="color:purple">CCC id=c2</div><div style="color:purple">CCC id=c3</div>