p & imag move into the observ element - XSLT [closed] - xslt

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How to move p & imag element move into the observ element?
Input XML:
<root>
<num>6</num>
<imag>
<apimag fic="[PHOTO]" scale="40"/>
</imag>
<qual>professeur a  l'universit</qual>
<h1>Contentieux sur la validité du brevet</h1>
<pnchr><observ/></pnchr>
<p>Selon 1</p>
<h2>Dalai de restauration</h2>
<pnchr><observ/></pnchr>
<p>Selon 2</p>
<imag>
<apimag fic="[PHOTO]" scale="40"/>
</imag>
<pnchr><observ/></pnchr>
<p>Selon 3</p>
<p>Selon 4</p>
</root>
Expected Output:
<root>
<num>6</num>
<imag>
<apimag fic="[PHOTO]" scale="40"/>
</imag>
<qual>professeur a  l'universit</qual>
<h1>Contentieux sur la validité du brevet</h1>
<pnchr><observ>
<p>Selon 1</p>
</observ></pnchr>
<h2>Dalai de restauration</h2>
<pnchr><observ>
<p>Selon 2</p>
<imag>
<apimag fic="[PHOTO]" scale="40"/>
</imag>
</observ></pnchr>
<pnchr><observ>
<p>Selon 3</p>
<p>Selon 4</p>
</observ></pnchr>
</root>

Answer 1

Something like this:
<xsl:template match="root">
<xsl:for-each-group select="*" group-starting-with="pnchr">
<xsl:choose>
<xsl:when test="self::pnchr">
<pnchr><observ>
<xsl:copy-of select="remove(current-group(),1)"/>
</observ></pnchr>
</xsl:when>
<xsl:otherwise>
<xsl:copy-of select="current-group()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
</xsl:template>