Doc:NIST SP 800-53r3 Appendix F/AU-12/2

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(2) The information system produces a system-wide (logical or physical) audit trail composed of audit records in a standardized format.
Enhancement Supplemental Guidance: Audit information normalized to a common standard promotes interoperability and exchange of such information between dissimilar devices and information systems. This facilitates an audit system that produces event information that can be more readily analyzed and correlated. System log records and audit records compliant with the Common Event Expression (CEE) are examples of standard formats for audit records. If individual logging mechanisms within the information system do not conform to a standardized format, the system may convert individual audit records into a standardized format when compiling the system-wide audit trail.