@Documented
 @Retention(value=RUNTIME)
 @Target(value=PARAMETER)
public static @interface DoFn.Timestamp
DoFn.ProcessElement, DoFn.GetInitialRestriction, DoFn.GetSize, DoFn.SplitRestriction, DoFn.GetInitialWatermarkEstimatorState, DoFn.NewWatermarkEstimator, and DoFn.NewTracker
 methods.