<?xml version="1.0"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes" />
<xsl:template match="body">
<xsl:copy>
<xsl:for-each-group select="*" group-starting-with="h1">
<xsl:apply-templates select="." mode="group" />
</xsl:for-each-group>
</xsl:copy>
</xsl:template>
<xsl:template match="h1" mode="group">
<div>
<head>
<xsl:value-of select="." />
</head>
<xsl:for-each-group select="current-group() except ."
group-starting-with="h2">
<xsl:apply-templates select="." mode="group" />
</xsl:for-each-group>
</div>
</xsl:template>
<xsl:template match="h2" mode="group">
<div>
<head>
<xsl:value-of select="." />
</head>
<xsl:for-each-group select="current-group() except ."
group-starting-with="h3">
<xsl:apply-templates select="." mode="group" />
</xsl:for-each-group>
</div>
</xsl:template>
<xsl:template match="h3" mode="group">
<div>
<head>
<xsl:value-of select="." />
</head>
<xsl:copy-of select="current-group() except ." />
</div>
</xsl:template>
<xsl:template match="p" mode="group">
<xsl:copy-of select="current-group()" />
</xsl:template>
</xsl:stylesheet>
Output:
<?xml version="1.0" encoding="UTF-8"?>
A
B
C
D
E
F
G
H
I
J
K
L
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