| Attribute | Schema Datatype or Enumeration | Usage | Definition | Business Rules |
|---|---|---|---|---|
| OID | oid | Required | Unique identifier. | |
| Name | name | Required | Human readable name. | |
| (StudyEventGroupOID, StudyEventOID) | oidref | Reference to StudyEventGroup or StudyEvent definition element. | ||
| TimepointTarget | incompleteDatetime | Required | Specifies the targetted datetime. | |
| TimepointPreWindow | durationDatetime | Optional |
| Specifies the amount of time before the TimepointTarget that the activity may be started. | Must be expressed as an ISO 8601 duration. | |
| TimepointPostWindow | durationDatetime | Optional |
| the amount of time after the TimepointTarget that the activity can be started. | Must be expressed as an ISO 8601 duration. |