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When using "//" at the beginning of a location path, "//" selects all nodes in the document of the specified type.
When using "//" in the middle of a location path, "//" selects all nodes which appear in the node selected with the first part of the location path.
File: Data.xml
<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">
<DDD id="d1"/>
</CCC>
<BBB id="b5">
<CCC id="c2"/>
</BBB>
</AAA>
</data>
File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<xsl:apply-templates select="//BBB"/>
<xsl:apply-templates select="//CCC"/>
<xsl:apply-templates select="//DDD"/>
<xsl:apply-templates select="//AAA"/>
</xsl:template>
<xsl:template match="AAA">
<div style="color:navy">
<xsl:value-of select="name()"/>
<xsl:text> id=</xsl:text>
<xsl:value-of select="@id"/>
</div>
</xsl:template>
<xsl:template match="BBB">
<div style="color:purple">
<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:red">
<xsl:value-of select="name()"/>
<xsl:text> id=</xsl:text>
<xsl:value-of select="@id"/>
</div>
</xsl:template>
<xsl:template match="DDD">
<div style="color:blue">
<xsl:value-of select="name()"/>
<xsl:text> id=</xsl:text>
<xsl:value-of select="@id"/>
</div>
</xsl:template>
</xsl:stylesheet>
<?xml version="1.0" encoding="UTF-8"?><div style="color:purple">BBB id=b1</div><div style="color:purple">BBB id=b2</div><div style="color:purple">BBB id=b3</div><div style="color:purple">BBB id=b4</div><div style="color:purple">BBB id=b5</div><div style="color:red">CCC id=c1</div><div style="color:red">CCC id=c2</div><div style="color:blue">DDD id=d1</div><div style="color:navy">AAA id=a1</div><div style="color:navy">AAA id=a2</div>
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