Splitting XML with a common head node and several bodies node into multiple files with XSLT

I have an XML document, structured like the following example:

<p:Document versione="1.0">
  <DocumentHeader>
     global header
  </DocumentHeader>
  <DocumentBody>
     body 1
  </DocumentBody>
  <DocumentBody>
     body 2
  </DocumentBody>
</p:Document>

Note that "global header" and "body X" may rappresent nested xml-blocks, not just plain text.

and I need to split this XML file into - in this example - two XML files, like the followings:

<p:Document versione="1.0">
  <DocumentHeader>
     global header
  </DocumentHeader>
  <DocumentBody>
     body 1
  </DocumentBody>
</p:Document>

and

<p:Document versione="1.0">
  <DocumentHeader>
     global header
  </DocumentHeader>
  <DocumentBody>
     body 2
  </DocumentBody>
</p:Document>

Generally, I have to create several new XML, one for each DocumentBody node, putting the same DocumentHeader node in each new file created.

I think an XSL transformation is the best way to do this, but I dont know how. I've tried to use the example reported here, but these cases don't manage an "header" node.

<xsl:template match="/root">
  <xsl:for-each select="DocumentBody">
    <xsl:result-document method="xml" href="file_{@id}-output.xml">
      <root>
        <xsl:copy-of select="/root/@*" />
        <DocumentBody>
          <xsl:copy-of select="../@* | ." />
        </DocumentBody>
      </root>
    </xsl:result-document>
  </xsl:for-each>
</xsl:template> 

Can you help me?