A description of the reasons that the classification of this element is more restrictive
than a simple roll-up of the
sub elements would result in. This acts as an indicator to rule engines that there
is not accidental over classification
going on and to users that special care beyond what the portion marks reveal must
be taken when using this data. Use of this
mark does not replace the need for the compilation reason being defined in the prose
in accordance with ISOO Directive 1.
For example this would document why 3 Unclassified bullet items form a Secret List.
Without this reason being noted the above described document would be considered to
be miss-marked and overclassified.