@abc.abstractmethod<EOL><INDENT>def set_superseded_event_position(self, position):<DEDENT>
pass<EOL>
Sets the superseded position.

        A negative number counts from the end of the series.

        :param position: the new superseded position
        :type position: ``integer``
        :raise: ``InvalidArgument`` -- ``position`` is invalid
        :raise: ``NoAccess`` -- ``position`` cannot be modified

        *compliance: mandatory -- This method must be implemented.*