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The RelativeTimingConstraint element describes a relative timing constraint between two 2 activities or groups of activities, represented by StudyEventGroups, StudyEvents, ItemGroups, or Items. An in time earlier StudyEventGroup, to which the constraint applies, is referenced by the PredecessorStudyEventGroupOID.
TODO: describe similar for StudyEvent, ItemGroup and Item (i.e. PredecessorStudyEventOID, PredecessorItemGroupOID, PredecessorItemOID).
ALTERNATIVE: use "PredecessorOID" for all of these.
An in time earlier StudyEvent, to which the constraint applies, is referenced by the PredecessorStudyEventOID. An in time later StudyEventGroup, to which the constraint applies, is referenced by the SuccessorStudyEventGroupOID. An in time later StudyEvent, to which the constraint applies, is referenced by the SuccessorStudyEventOID.
If the two activities are used in a defined workflow, and there is a transition between the two activities in that workflow, then TransitionTimingConstraint must be used to describe the timing, instead of RelativeTimingConstraint.
The Type attribute defines whether the constraint applies to start or to end of the activities. Valid values for the attribute are:
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If the Type attribute is omitted, "StartToStart" must be assumed.
The TimepointRelativeTarget defines the planned time between the two activities, expressed as a non-negative ISO 8601 duration.
The TimepointPreWindow describes the amount of time, expressed as a non-negative ISO 8601 duration, to which the relative time between the two activities may be shortened with respect to the value in TimepointRelativeTarget.
The TimepointPostWindow describes the amount of time, expressed as a non-negative ISO 8601 duration, to which the relative time between the two activities may be elongated with respect to the value in TimepointRelativeTarget.