A HistoricalEventNode that has Event history available will provide the Property. This Property is formally defined in Table 7.
Table 7 – Historical Events Properties
|HistoricalEventFilter||M||EventFilter||A filter used by the Server to determine which HistoricalEventNode fields are available in history. It may also include a where clause that indicates the types of Events or restrictions on the Events that are available via the HistoricalEventNode.
The HistoricalEventFilter Property can be used as a guideline for what Event fields the Historian is currently storing. But this field may have no bearing on what Event fields the Historian is capable of storing.