| id | No | string | Unique id for inter-element referencing |
| extension | No | Extension[] | Additional content defined by implementations |
| modifierExtension | No | Extension[] | Extensions that cannot be ignored even if unrecognized |
| event | No | dateTime[] | When the event occurs |
| repeat | No | Element | When the event is to occur |
| - id | No | string | Unique id for inter-element referencing |
| - extension | No | Extension[] | Additional content defined by implementations |
| - bounds[x] | No | Duration, Range, Period | Length/Range of lengths, or (Start and/or end) limits |
| - count | No | positiveInt | Number of times to repeat |
| - countMax | No | positiveInt | Maximum number of times to repeat |
| - duration | No | decimal | How long when it happens |
| - durationMax | No | decimal | How long when it happens (Max) |
| - durationUnit | No | code | s / min / h / d / wk / mo / a - unit of time (UCUM) |
| - frequency | No | positiveInt | Event occurs frequency times per period |
| - frequencyMax | No | positiveInt | Event occurs up to frequencyMax times per period |
| - period | No | decimal | Event occurs frequency times per period |
| - periodMax | No | decimal | Upper limit of period (3-4 hours) |
| - periodUnit | No | code | s / min / h / d / wk / mo / a - unit of time (UCUM) |
| - dayOfWeek | No | code[] | mon / tue / wed / thu / fri / sat / sun |
| - timeOfDay | No | time[] | Time of day for action |
| - when | No | code[] | Code for time period of occurrence |
| - offset | No | unsignedInt | Minutes from event (before or after) |
| code | No | CodeableConcept | BID / TID / QID / AM / PM / QD / QOD / + |
