The BLANK option specifies up to ten alternate symbols for the blank character.
.------. V | >>-BLANK--(-'---char-+-'--)------------------------------------><
The IBM-supplied default code point for the BLANK symbol is X'05'.
You cannot specify any of the alphabetic characters, digits, and special characters defined in the PL/I Language Reference.
If you specify the BLANK option, the standard blank symbol is still recognized as a blank.