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A language for authoring security checklists/benchmarks and for reporting results of evaluating them.
CNSSI 4009-2015 under eXtensible configuration checklist description format (XCCDF) from NIST SP 800-126 Rev. 2
SCAP language for specifying checklists and reporting checklist results.
NIST SP 800-128 under Extensible Configuration Checklist Description Format (XCCDF)