values associated with the starting and ending time

Note 1 to entry: BoundingValues are the values that are associated with the starting and ending time of a ProcessingInterval specified when reading from the historian. BoundingValues may be required by Clients to determine the starting and ending values when requesting RawData over a time range. If a RawData value exists at the start or end point, it is considered the bounding value even though it is part of the data request. If no RawData value exists at the start or end point, then the Server will determine the boundary value, which may require data from a data point outside of the requested range. See 4.6 for details on using BoundingValues.