DurationTimingConstraint
<RelativeTimingConstraint OID="DTC-ODMV2-EX" Name="VISIT2 Duration Timing Constraint" StructuralElementOID="SEG.VIS2" DurationTarget="P6M" DurationPreWindow="P1M" DurationPostWindow="P4M" />
<RelativeTimingConstraint OID="DTC-ODMV2-EX" Name="VISIT2 Duration Timing Constraint" StructuralElementOID="SEG.VIS2" DurationTarget="P6M" DurationPreWindow="P1M" DurationPostWindow="P4M" />