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• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  6.5.8 Auditing for Attribute Service Set
  AuditHistoryUpdateEventType or a subtype of it. Three subtypes of AuditHistoryUpdateEventType are defined as AuditHistoryEventUpdateEventType , AuditHistoryValueUpdateEventType and AuditHistoryDeleteEventType . The subtype depends on the type of operation being performed, historical event update