HistoricalEventNodesare Objectsor Viewsin the AddressSpacethat expose historical Events. These Nodesare identified via the EventNotifier Attribute, and provide some historical subset of the Eventsgenerated by the Server.
Not every Objector Viewin the AddressSpacemay be a HistoricalEventNode. To qualify as HistoricalEventNodes, a Nodehas to contain historical Events. To see if historical Eventsare available, a Clientwill look for the HistoryRead/Write states in the EventNotifier Attribute. See OPC 10000-3for details on the use of this Attribute.