OptionalActualOptionalActualOptionalActualOptionalCompletionPercent complete 0..100
OptionalDescriptionOptionalDurationOptionalEarlyOptionalEarlyOptionalFreeOptionalIdentificationOptionalIsOptionalIsOptionalLateOptionalLateOptionalLongOptionalObjectOptionalPredefinedOptionalPriorityOptionalRemainingOptionalScheduleOptionalScheduleOptionalScheduleISO 8601 datetime
OptionalStatusOptionalStatusOptionalTotalOptionalWork
IfcTask parameters.
When any of the *Start / *Finish / *Duration / IsCritical / Completion fields is supplied, an IfcTaskTime is created and linked.