code: protected void compareDocumentType(DocumentType control, DocumentType test,
                                         DifferenceListener listener) throws DifferenceFoundException {
          compare(control.getName(), test.getName(), control, test, listener,
                  DOCTYPE_NAME);
          compare(control.getPublicId(), test.getPublicId(), control, test, listener,
                  DOCTYPE_PUBLIC_ID);
  
          compare(control.getSystemId(), test.getSystemId(),
                  control, test, listener, DOCTYPE_SYSTEM_ID);
      }
docs: Compare two DocumentType nodes
  @param control
  @param test
  @param listener
  @throws DifferenceFoundException