code: def app_to_object(self):
          
          if self.tagClass != Tag.applicationTagClass:
              raise ValueError("application tag required")
  
          # get the class to build
          klass = self._app_tag_class[self.tagNumber]
          if not klass:
              return None
  
          # build an object, tell it to decode this tag, and return it
          return klass(self)
docs: Return the application object encoded by the tag.