If true, indicates that the specified times, frequencies, periods are expected to be adhered to as precisely as possible. If false, indicates that a typical degree of variability based on institutional and/or patient convenience is acceptable.

Days of a possibly repeating cycle on which the action is to be performed. The cycle is defined by the first action with a timing element that is a parent of the daysOfCycle.

When present, this extension indicate that the event actually only occurs on the specified days of the month, on the times as otherwise specified by the timing schedule.