??
    @classmethod
    def validate_dbus_object(cls, path, _state):
        """Return whether this class is the appropriate proxy object class for
        a given dbus path and state.

        The default version matches the name of the dbus object and the class.
        Subclasses of CustomProxyObject can override it to define a different
        validation method.

        :param path: The dbus path of the object to check
        :param state: The dbus state dict of the object to check
                      (ignored in default implementation)
        :returns: Whether this class is appropriate for the dbus object

        """
        state_name = xpathselect.get_classname_from_path(path)
        if isinstance(state_name, str):
            state_name = state_name.encode('utf-8')
        class_name = cls.__name__.encode('utf-8')
        return state_name == class_name

??
    @classmethod
    def validate_dbus_object(cls, path, state):
        name = introspection.get_classname_from_path(path)
        return (name == b'webbrowser-app' and
                state['applicationName'][1] == 'webbrowser-app')