9 Standard EventTypes 
9.9 AuditSessionEventType
This is a subtype of AuditSecurityEventType and is used for categorization of security-related Events from the Session Service Set defined in OPC 10000-4.
Online versions of OPC UA specifications and information models.
This is a subtype of AuditSecurityEventType and is used for categorization of security-related Events from the Session Service Set defined in OPC 10000-4.