A Serverthat maintains an audit log shall provide the audit log entries via Event Messages. The AuditEventType and its sub-types are defined in OPC 10000-3. An audit Event Messagealso includes the audit record Id. The details of the AuditEventTypeand its subtypes are defined in OPC 10000-5. A Serverthat is an aggregating Serverthat supports auditing shall also subscribe for audit events for all of the Serversthat it is aggregating (assuming they provide auditing). The combined stream should be available from the aggregating Server.