@utilities.arguments_not_none<EOL><INDENT>def register_for_changed_item(self, item_id):<DEDENT>
<EOL>if not MONGO_LISTENER.receivers[self._ns][self._receiver]['<STR_LIT:u>']:<EOL><INDENT>MONGO_LISTENER.receivers[self._ns][self._receiver]['<STR_LIT:u>'] = []<EOL><DEDENT>if isinstance(MONGO_LISTENER.receivers[self._ns][self._receiver]['<STR_LIT:u>'], list):<EOL><INDENT>MONGO_LISTENER.receivers[self._ns][self._receiver]['<STR_LIT:u>'].append(item_id.get_identifier())<EOL><DEDENT>
Registers for notification of an updated assessment item.

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

        arg:    item_id (osid.id.Id): the ``Id`` of the ``Assessment``
                to monitor
        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.*