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 (optional): ICF file fields must have at least a name
(as in FIELDA) and a length. Other attributes can be specified
explicitly or by default.
Notes:
- Items (3) and (4) can be repeated to specify new record
formats within the ICF file.
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