BTW: SP 800-53 rev 4 <http://csrc.nist.gov/publications/drafts/800-53-rev4/sp800_53_r4_draft_fpd.pdf> is just out in draft.I wonder if they would be so bold as to put it into a standardized, machine-parseable format. It would be far more useful if it were available in more than just an opaque human-readable format.
<reference href="https://web.nvd.nist.gov/view/800-53/control?controlName=CM-7#enhancement-2">CM-7(2)</reference>