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Compartmented Mode Workstation Labeling: Encodings Format
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Document Information


1.  Introduction

2.  Structure and Syntax of Encodings File

3.  Classification Encodings

4.  Information Label Encodings

5.  Sensitivity Label, Clearance, Channels, and Printer Banner Encodings

6.  Accreditation Range and Name Information Label Encodings

7.  General Considerations for Specifying Encodings

The Minimum Information Label

The Maximum Sensitivity Label

Consistency of Word Specification among Different Types of Labels

Mandatory Access Control Considerations When Encoding Words

Encoding MAC Words

Encoding MAC-Related Words

Encoding Non-MAC-Related Words

Using Initial Compartments and Markings to Specify Inverse Compartment and Marking Bits

Using Prefixes to Specify Special Inverse Compartment and Marking Bits

Choosing Names

Specifying Aliases

Avoiding "Loops" In Required Combinations

Visibility Restrictions for Required Combinations

Relationships between Required Combinations and Combination Constraints

Restrictions on Specifying Information Label Combination Constraints

Modifying Encodings Already Used by the System

Consistency of Default Word Specification

8.  Enforcing Proper Label Adjudications

A.  Encodings Specifications Error Messages

B.  Annotated Sample Encodings

C.  CMW Labeling Software C1.0 Release Notes, 6/8/93



Restrictions on Specifying Information Label Combination Constraints

Information label combination constraints are used by the labeling software to ensure that no invalid combinations of words are allowed to be specified in a single information label. However, any two valid information labels can be combined by the system by bitwise or-ing the compartment and marking bits. Thus if a combination constraint is specified that (using examples from Appendix B, Annotated Sample Encodings) subcompartment SA and subcompartment SB cannot be combined, an inconsistent situation has arisen. The inconsistency is that SA and SB cannot be combined by entering them in a single information label, yet two separate information labels, each with one of the subcompartments, can be combined to produce a new information label with both subcompartments. Therefore, to avoid such inconsistencies, you should never specify any combination constraints that are not automatically enforced on combinations by the encodings.

Examples of constraints automatically enforced on combinations by the encodings abound when considering inverse words. If two inverse words IW1 and IW2 are constrained not to be combined with the combination constraint:

IW1 ! IW2

then you can be assured that IW1 and IW2 can never be put together as a result of the combination of two labels. Why? Because inverse words combine by having only those inverse words in both of the labels being combined appear in the resulting label. Therefore, if both IW1 and IW2 cannot appear in any single information label, then no combination of information labels can combine IW1 and IW2 together.

Thus, you can be assured of avoiding inconsistencies if only inverse words are used in ! constraints and in the left hand side of & constraints.