docs: def meta_changed(self, model, prop_name, info):
          """This method notifies the parent state about changes made to the meta data
          """
          if self.parent is not None:
              msg = info.arg
              # Add information about notification to the signal message
              notification = Notification(model, prop_name, info)
              msg = msg._replace(notification=notification)
              info.arg = msg
              self.parent.meta_changed(model, prop_name, info)