Annex A (informative) Aggregate Specific examples – Historical Access 
A.1 Historical Aggregate specific characteristics 
A.1.4 Example Aggregate data – Historian 4
This example is included to illustrate Boolean data. For the purposes of Historian 4 examples consider a source historian with the following data:
| Timestamp | Value | StatusCode | Notes |
|---|---|---|---|
| 12:00:00 | - | Bad_NoData | First archive entry, Point created |
| 12:00:02 | TRUE | Raw, Good | |
| 12:00:25 | FALSE | Raw, Good | |
| 12:00:28 | TRUE | Raw, Good | |
| 12:00:39 | TRUE | Raw, Good | |
| 12:00:42 | - | Raw, Bad | Bad quality data received, Bad data entered |
| 12:00:48 | TRUE | Raw, Good | Received Good StatusCode value |
| 12:00:52 | FALSE | Raw, Good | |
| 12:01:12 | FALSE | Raw, Good | |
| 12:01:17 | TRUE | Raw, Uncertain | Value is flagged as questionable |
| 12:01:23 | TRUE | Raw, Good | |
| 12:01:26 | FALSE | Raw, Good | |
| 12:01:30 | TRUE | Raw, Good | |
| - | No Data | No more entries, awaiting next Value |
For the purposes of all Historian 4 examples:
- TreatUncertainAsBad = True. Therefore Uncertain values are treated as Bad, and not included in the Aggregate call.
- Stepped Attribute = True. Therefore SteppedInterpolation is used between data points.
- UseSlopedExtrapolation = False. Therefore SteppedExtrapolation is used at end boundary conditions.
- PercentGood = 100, PercentBad = 100. For Boolean data interpolation and extrapolation shall always be stepped.