Valid Labels

Rules in the label_encodings(4) file may disqualify certain combinations of label components. Valid or well-formed labels are those labels that satisfy the rules.

The rules are defined by the constraints specified for each type of label, which include:

• Initial compartments associated with each classification

• The minimum classification, output minimum classification, and maximum classification associated with each word

• Hierarchies defined by the bit patterns chosen for each word

• The required combinations of words

• The combination constraints that apply to the words.

  A sensitivity label must be well formed. Clearances do not need to be well-formed.

Example

If, for example, words A, B, and C are constrained from appearing together in a sensitivity label, the following table shows valid labels and clearances. Note that TS ABC is a valid clearance but is not a valid sensitivity label. The TS ABC clearance would allow a user access to files labeled with TS A, TS B, and TS C.

Table 1-11 Example of Valid Labels and Clearances

Valid SLs	Valid Clearances
TS A	TS ABC	TS A
TS B	TS AB	TS B
TS C	TS AC	TS C