code: def install_basic_multifile_support(self):
          
          if not self.multifile_installed:
              self.register_parser(MultifileCollectionParser(self))
              self.register_parser(MultifileObjectParser(self, self))
              self.multifile_installed = True
          else:
              raise Exception('Multifile support has already been installed')
docs: Utility method for users who created a RootParser with register_default_plugins=False, in order to register only
           the multifile support
          :return: