@abc.abstractmethod<EOL><INDENT>def create_superseding_event(self, superseding_event_form):<DEDENT>
return<EOL>
Creates a new ``SupersedingEvent``.

        :param superseding_event_form: the form for this ``SupersedingEvent``
        :type superseding_event_form: ``osid.calendaring.SupersedingEventForm``
        :return: the new ``SupersedingEvent``
        :rtype: ``osid.calendaring.SupersedingEvent``
        :raise: ``IllegalState`` -- ``supersdeing_event_form`` already used in a create transaction
        :raise: ``InvalidArgument`` -- one or more of the form elements is invalid
        :raise: ``NullArgument`` -- ``supersdeing_event_form`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure
        :raise: ``Unsupported`` -- ``superseding_event_form`` did not originate from
        ``get_superseding_event_form_for_create()``

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