FUNCTION acyclic_time_interval_relationship
(relation : time_interval_relationship, relatives : SET [1:?] OF time_interval, specific_relation : STRING) : BOOLEAN;
LOCAL x : SET OF time_interval_relationship; END_LOCAL;
IF relation.relating_time_interval IN relatives THEN RETURN (FALSE); END_IF; x := QUERY(ti <* bag_to_set(USEDIN(relation.relating_time_interval, 'DATE_TIME_SCHEMA.' + 'TIME_INTERVAL_RELATIONSHIP.' + 'RELATED_TIME_INTERVAL')) | specific_relation IN TYPEOF(ti)); REPEAT i := 1 TO HIINDEX(x); IF NOT acyclic_time_interval_relationship(x[i], relatives + relation.relating_time_interval, specific_relation) THEN RETURN (FALSE); END_IF; END_REPEAT; RETURN (TRUE); END_FUNCTION; -- acyclic_time_interval_relationship
|