XSLT How to copy following elements inside the new group - xslt-2.0

Question

I have this flat xml. i need to group the contents on h1/title and copy all following para's until next h1/title pattern if exists else add empty para.
Source XML:
<Element>
<h1>
<title>Name1</title>
</h1>
<h1>
<title>Name2</title>
</h1>
<para>Test1</para>
<para>Test2</para>
<h1>
<title>Name3</title>
</h1>
<para>Test3</para>
<para>Test4</para>
</Element>
I want the output like below.
<Element>
<group>
<h1>
<title>Name1</title>
</h1>
<para> </para>
</group>
<group>
<h1>
<title>Name2</title>
</h1>
<para>Test1</para>
<para>Test2</para>
</group>
<group>
<h1>
<title>Name3</title>
</h1>
<para>Test3</para>
<para>Test4</para>
</group>
</Element>
so far I have tried following template, it does not copy following para's.
<xsl:template match="h1">
<group>
<xsl:copy>
<xsl:for-each-group select="*" group-starting-with="h1">
<xsl:choose>
<xsl:when test="self::h1">
<group>
<xsl:apply-templates select="current-group()"/>
<xsl:apply-templates select="following-sibling::para[not(following::h1)]"/>
</group>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates select="current-group()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
</xsl:copy>
</group>
</xsl:template>

Answer 1

I would suggest to group the children of the Element element and then of course inside of the for-each-group you can simply check whether there is no second group item to add the empty para:
<?xml version="1.0" encoding="UTF-8" ?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
<xsl:output indent="yes"/>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="Element">
<xsl:copy>
<xsl:for-each-group select="*" group-starting-with="h1">
<xsl:choose>
<xsl:when test="self::h1">
<group>
<xsl:apply-templates select="current-group()"/>
<xsl:if test="not(current-group()[2])">
<para/>
</xsl:if>
</group>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates select="current-group()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
</xsl:copy>
</xsl:template>
</xsl:transform>
Online at http://xsltransform.net/naZXpX7.