- 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.
- 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.
- See the Positional entries for physical and logical files topic for a description of each of the columns shown in the figure.