The text read off it
[page 85]
data description is written, regardless of how the area is to be used. Certain special provisions, especially those governing input and output, are built into the processor for each system, and these are described in the manuals for the various processors.
The programmer, however, must be sure that all data-names required for input and output, as specified in the manual for the system he is using, are properly described in the data description. He should also examine his program to be sure that every item of data used in the program, whether as input, output, or for intermediate operations, is properly described. The processor will then make all necessary provisions for storage space and for identifying the data to be stored.