DDS concepts

- (1)
- Comments (optional): Comments can appear on any line in DDS.
They are identified by an asterisk in position 7.
- (2)
- File level (optional): File-level keywords appear before the first
record format name (RECORDA on line 00040).
- (3)
- Record level (at least one required): R in position 17 identifies
RECORDA as a record format name. The record level continues until the
first field is specified.
- (4)
- Field level (at least one field, whether named or unnamed, is required in
each record format in the file): Printer file fields that are passed
from the program to the printer must be named fields and must have a length
specified. Other attributes can be specified explicitly or by
default. Constant (unnamed) fields require only a location and a
keyword, as described in the DATE, DFT, PAGNBR, TIME, and MSGCON keyword
descriptions in the keyword topic for printer files.
Notes:
- Items (3) and (4) can be repeated to specify new record
formats within the printer file.
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