The USAGE Clause
General Format
The General Format is extended by the addition of the following:

Syntax Rules
- The PICTURE character-string can contain only "N"s, "B"s, "/"s,
and "0"s.
Whenever a PICTURE clause contains an "N" the associated item is
considered to be of class NCHAR, Japanese.
- The BLANK WHEN ZERO clause cannot be used with group or
elementary items described as USAGE IS NCHAR or USAGE IS JAPANESE. The
SYNCHRONIZED clause is ignored.
General Rules
- The USAGE IS NCHAR or USAGE IS JAPANESE clause indicates that the
format of the data is NCHAR.