The USAGE Clause (DBCS)

Syntax Rules

1. The PICTURE character-string of a DISPLAY-1 item can contain only "G"s and "B" s. An item whose PICTURE character-string contains "G"s must have a USAGE IS DISPLAY-1 clause.

   Note that therefore the USAGE IS DISPLAY-1 clause makes an item's class DBCS.

     USAGE IS DISPLAY-1 is not required for items whose PICTURE clause contains

     "G"s or

     "N"s.

     Whenever a PICTURE clause contains a "G" the associated item is considered to be of class DBCS.

2. The BLANK WHEN ZERO clause cannot be used with group or elementary items described as USAGE IS DISPLAY-1. The SYNCHRONIZED clause is ignored.
3. The usage of a Screen Section data item may be implicitly or explicitly defined as USAGE DISPLAY-1.