@abc.abstractmethod<EOL><INDENT>def register_for_changed_item(self, item_id):<DEDENT>
pass<EOL>
Registers for notification of an updated assessment item.

        ``ItemReceiver.changedItems()`` is invoked when the specified
        assessment item is changed.

        :param item_id: the ``Id`` of the ``Assessment`` to monitor
        :type item_id: ``osid.id.Id``
        :raise: ``NotFound`` -- an ``item`` was not found identified by the given ``Id``
        :raise: ``NullArgument`` -- ``item_id is null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure occurred

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