| Segment specification | DFN |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To specify a definition function. |
| —————————————————————————————————————————————— |
| 010 |
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9023 | Definition function code | M | 1 | an..3 | |||
| 020 |
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9025 | Definition extent code | C | 1 | an..3 | |||
| 030 |
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4519 | Definition identifier | C | 1 | an..35 |
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