ScheduledActivity RefId SchoolInfoRefId TimeTableCellRefId DayId PeriodId TimeTableRefId ActivityDate ActivityEndDate StartTime FinishTime CellType TimeTableSubjectRefId TeacherList RoomList AddressList Location ActivityType ActivityName ActivityComment StudentList TeachingGroupList YearLevels Override OverridePatch TimeTableChangeReasonList LocalCodeList SIF_Metadata SIF_ExtendedElements