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 (RECORD1 on line 00040).
- (3)
- Record level (at least one is required): R in position 17 identifies
RECORD1 as a record format name. In simple or multiple format logical
files, the PFILE keyword is required for every record format. The
record level continues until the first field is named.
- (4)
- Field level: Field names and field attributes are not required for
logical files. See the topic for logical file
positional entries for more information.
- (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 one or more field names (such as FIELDA)
after the field-level specifications.
- (6)
- Select and omit levels (optional): S in position 17 identifies
FIELDB as a select field. (O in position 17 identifies a field as an
omit field.) The select and omit levels follow the key field
level.
Notes:
- To form a multiple format logical file, specify more record formats within
the file by repeating items (3) through (6), or specify more
than one file on the PFILE keyword.
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