BellSchedule RefId SchoolInfoRefId SchoolYear BellScheduleName TimetableDayList TimetableDay Identifier Name TimetablePeriodList TimetablePeriod Identifier Name BellPeriodList BellPeriod TimetableDayIdentifier TimetablePeriodIdentifier StartTime EndTime RegularSchoolPeriod InstructionalMinutes UseInAttendanceCalculations SIF_Metadata SIF_ExtendedElements