XMLout($xml, RootName => 'declaration');

##</code><code>##

<declaration dd:maxOccur="-1" dd:minOccur="0" dd:nullType="exclude">
  <contentDeclaration dd:minOccur="0" dd:nullType="exclude" />
  <value dd:minOccur="0" dd:nullType="exclude" />
</declaration>