toXml method
      
XmlNode
toXml()
      
     
    
    
Implementation
XmlNode toXml() {
  final builder = XmlBuilder();
  builder.element('AccessControlPolicy', nest: () {
    builder.element('Grants', nest: grants!.toXml());
    builder.element('Owner', nest: owner!.toXml());
  });
  return builder.buildDocument();
}