code: def to_xml(self):
          
          changesXML = ""
          for change in self.changes:
              changeParams = {"action": change[0], "record": change[1].to_xml()}
              changesXML += self.ChangeXML % changeParams
          params = {"comment": self.comment, "changes": changesXML}
          return self.ChangeResourceRecordSetsBody % params
docs: Convert this ResourceRecordSet into XML
          to be saved via the ChangeResourceRecordSetsRequest