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 record
format name (RECORD on line 00040).
- (3)
- Record level (only one record is allowed in physical files): R in
position 17 identifies RECORD as a record format name. The record level
continues until the first field is named.
- (4)
- Field level (at least one field name is required, unless the FORMAT
keyword is specified on the record): For fields in physical files,
specify at least a name and length. Other attributes can be specified
explicitly or by default.
- (5)
- Key field level (optional): K in position 17 identifies the field as
a key field. A K must be specified for each key field. Specify
the key field level by repeating a field name (here, FIELDA) after the
field-level specifications.
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