Compartmented Mode Workstation Labeling: Encodings Format

The Omaxclass= Keyword

The optional omaxclass= keyword specifies the output maximum classification for the word. The output maximum classification is the maximum classification with which the word can be output (i.e., appear in a human-readable representation of a label converted from internal format). The classification specified starts with the first non-blank character following the blank after the keyword and continues up to the next semicolon or the end of the line. The classification can be the long, short, or alternate name of a classification defined in the CLASSIFICATIONS: section. If the output maximum classification with which a word can be associated is the classification with the highest value (as defined by the value= keyword), then there is no need to make an omaxclass= keyword specification.

This keyword supports a marking like EFTO (Encrypt For Transmission Only), which should appear in only UNCLASSIFIED human-readable labels, but is semantically present in all labels with classifications above UNCLASSIFIED. To support EFTO, with markings bit N, the encodings should specify markings bit N as a default bit for classification above UNCLASSIFIED:

CLASSIFICATIONS:

name= UNCLASSIFIED;	value= 1;	

name= CONFIDENTIAL;	value= 4;	initial markings= N;

name= SECRET:	value= 5;	initial markings= N;

name= TOP SECRET;	value= 6; 	initial markings= N;

and then specify EFTO as a word with an omaxclass of UNCLASSIFIED:

name= EFTO;   omaxclass=UNCLASSIFIED;   MARKINGS= N;

With these specifications, EFTO does not appear in human-readable representations of CONFIDENTIAL, SECRET, and TOP SECRET labels, but its internal (bit) representation is present in these labels. With these specifications, if an information label of UNCLASSIFIED EFTO is combined with one of SECRET, the result is SECRET.