code: def handle_help_command(self, scan_et):
          
          help_format = scan_et.attrib.get('format')
          if help_format is None or help_format == "text":
              # Default help format is text.
              return simple_response_str('help', 200, 'OK',
                                         self.get_help_text())
          elif help_format == "xml":
              text = self.get_xml_str(self.commands)
              return simple_response_str('help', 200, 'OK', text)
          raise OSPDError('Bogus help format', 'help')
docs: Handles <help> command.
  
          @return: Response string for <help> command.