@abc.abstractmethod<EOL><INDENT>def get_events_by_ids(self, event_ids):<DEDENT>
return<EOL>
Gets an ``EventList`` corresponding to the given ``IdList``.

        :param event_ids: the list of ``Ids`` to retrieve
        :type event_ids: ``osid.id.IdList``
        :return: the returned ``Event`` list
        :rtype: ``osid.calendaring.EventList``
        :raise: ``NotFound`` -- an ``Id was`` not found
        :raise: ``NullArgument`` -- ``event_ids`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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