Combine 2 different xml tags based on common attribute using XSLT

I have a xml with the following example

<Message>
 <Person>
  <Key>111</Key>
  <Name>John</Name>
  <Age>20</Age>
 </Person>
 <Person>
  <Key>112</Key>
  <Name>Alex</Name>
  <Age>20</Age>
 </Person>
 <Person>
  <Key>113</Key>
  <Name>Sean</Name>
  <Age>20</Age>
 </Person>
 <Car>
  <Key>111</Key>
  <Make>Toyota</Make>
  <Model>Camry</Model>
 </Car>
 <Car>
  <Key>111</Key>
  <Make>Toyota</Make>
  <Model>Corolla</Model>
 </Car>
 <Car>
  <Key>112</Key>
  <Make>Honda</Make>
  <Model>Civic</Model>
 </Car>
 <Car>
  <Key>113</Key>
  <Make>Lexus</Make>
  <Model>G300</Model>
 </Car>
</Message>

I would like to create a xml with the following using xslt:

<Message>
  <Person>
    <Key>111</Key>
    <Name>John</Name>
    <Age>20</Age>
  </Person>
  <Car>
    <Key>111</Key>
    <Make>Toyota</Make>
    <Model>Camry</Model>
  </Car>
  <Car>
    <Key>111</Key>
    <Make>Toyota</Make>
    <Model>Corolla</Model>
  </Car>
</Message>

I want to create a Message segment for each key and have the <person> and <car> segments in there for each key. How can I do this with xslt 2.0?

Solution

To use for-each-group as suggested in a comment use

  <xsl:template match="Message">
      <xsl:for-each-group select="*" group-by="Key">
          <Message>
              <xsl:copy-of select="current-group()"/>
          </Message>
      </xsl:for-each-group>
  </xsl:template>

full stylesheet is

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    exclude-result-prefixes="xs"
    version="3.0">

  <xsl:output indent="yes"/>

  <xsl:template match="Message">
      <xsl:for-each-group select="*" group-by="Key">
          <Message>
              <xsl:copy-of select="current-group()"/>
          </Message>
      </xsl:for-each-group>
  </xsl:template>

</xsl:stylesheet>

online at https://xsltfiddle.liberty-development.net/gWmuiJs.