| Segment specification | DII |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To identify a directory and to give its release, status, controlling agency, language and maintenance operation. |
| —————————————————————————————————————————————— |
| 010 |
|
1056 | Version identifier | M | 1 | an..9 | |||
| 020 |
|
1058 | Release identifier | M | 1 | an..9 | |||
| 030 |
|
9148 | Directory status identifier | C | 1 | an..3 | |||
| 040 |
|
1476 | Controlling agency identifier | C | 1 | an..2 | |||
| 050 |
|
3453 | Language name code | C | 1 | an..3 | |||
| 060 |
|
4513 | Maintenance operation code | C | 1 | an..3 |
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