How to group by the elements in XSL - xslt-2.0

Question

I have an HTML of the following process.
<p class="Ahead">FIRST SECTION</p>
<p class="Text">with a moisture content of 16.34</p>
<p class="Ahead">SECOND SECTION</p>
<p class="Bhead">Second First Section</p>
<p class="Text">with a moisture content of 20.56</p>
<p class="Chead">Second first first section</p>
<p class="Text">with a moisture content of 48.15</p>
The Ahead, Bhead and Chead should be individual group. How it is possible to group it.
The output should be follow below.
<sec>
<title>FIRST SECTION</title>
<p class="Text">with a moisture content of 16.34</p>
</sec>
<sec>
<title>SECOND SECTION</title>
<sec
<title>Second First Section</title>
<p class="Text">with a moisture content of 20.56</p>
<sec>
<title>Second first first section</title>
<p class="Text">with a moisture content of 48.15</p>
</sec>
</sec>
</sec>
Thanks in advance.

Answer 1

Something like this:
<xsl:function name="f:group">
<xsl:param name="level" as="xs:integer"/>
<xsl:param name="population" as="element()*"/>
<xsl:variable name="name" select="('Ahead', 'Bhead', 'Chead')[$level]"/>
<xsl:for-each-group select="$population"
group-starting-with="p[#class=$name]">
<xsl:choose>
<xsl:when test="#class='Text'">
<xsl:copy-of select="current-group()"/>
</xsl:when>
<xsl:otherwise>
<xsl:sequence select="f:group($level+1, current-group())"/>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
</xsl:function>
then:
<xsl:template match="/">
<xsl:sequence select="f:group(1, //p)"/>
</xsl:template>
Not tested, just something for you to start with.