HIGH-VALUE, HIGH-VALUES
Represents one or more occurrences of the character that has the highest ordinal position in the collating sequence used.
HIGH-VALUE is treated as an alphanumeric literal in a context that requires an alphanumeric character. For alphanumeric data with the EBCDIC collating sequence, the value is X’FF’. For other alphanumeric data, the value depends on the collating sequence in effect.
HIGH-VALUE is treated as a national literal when used in a context that requires a national literal. The value is national character NX’FFFF’.
When the context cannot be determined, an alphanumeric context is assumed and the value X’FF’ is used.
Usage note: You should not use HIGH-VALUE (or a value assigned from HIGH-VALUE) in a way that results in conversion between one data representation and another.
X’FF’ does not represent a valid EBCDIC character, and NX’FFFF’ does not represent a valid national character.
Conversion of either the alphanumeric or the national HIGH-VALUE representation to another representation results in a substitution character. For example, conversion of X’FF’ to UTF-16 would give a substitution character, not NX’FFFF’.
LOW-VALUE, LOW-VALUES
Represents one or more occurrences of the character that has the lowest ordinal position in the collating sequence used.
LOW-VALUE is treated as an alphanumeric literal in a context that requires an alphanumeric character. For alphanumeric data with the EBCDIC collating sequence, the value is X’00’. For other alphanumeric data, the value depends on the collating sequence in effect.
LOW-VALUE is treated as a national literal when used in a context that requires a national literal. The value is national character NX’0000′.
When the context cannot be determined, an alphanumeric context is assumed and the value X’00’ is used.
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