Mapping Simple data types

Optional values

Where an Optional attribute has not been given a value, it shall be encoded as a dollar sign "$".

Boolean

The EXPRESS element of BOOLEAN shall be treated as a pre-defined enumerated data type with a value encoded as "T" (for TRUE) and "F" (for FALSE).

Logical

The EXPRESS element of LOGICAL shall be treated as a pre-defined enumerated data type with a value encoded as "T" (for TRUE), "F" (for FALSE) and "U" (for UNKNOWN).

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