IBM 3742 Reference Manual page 42

To cause the program that is to process each record type to
be selected automatically, write mask statements. Each
mask statement indicates the conditions that must be satis-
fied before a program is selected. The mask statements for
this example begin in program buffer 5. Each mask state-
ment is separated by a semicolon. The colon is used at the
end of program buffers 5 and 6 to indicate that the mask
statements are continued in the next program buffer. The
mask statements follow:
Program Buffer 5
<1010WA&025WB,C
~
36
Selects program level
1 if position 10
contains an A and
position 25 contains
a
B or
a
C.
;2050WO,1,2,3:
---------
Selects program level 2
if position 50 is numeric.
This mask statement is
continued in program
buffer 6.
Program Buffer 6
<,4,5,6,7,8,9;3050Wo&051Wo&052WD&053Wo&:
~-
---
Continued
from program
buffer 5
Program Buffer 7
Selects program level 3 if positions
50-55 are blank. (The
b
represents
a blank space.) This mask statement
is continued in program buffer 7.
<054Wo&055WD;4.
~~
Continued from Selects program level 4 if another
program buffer 6 program level has not been selected.