| Segment specification | CMP |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To identify a composite data element and to give its class and maintenance operation. |
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| 010 |
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9146 | Composite data element tag identifier | M | 1 | an..4 | |||
| 020 |
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1507 | Designated class code | C | 1 | an..3 | |||
| 030 |
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4513 | Maintenance operation code | C | 1 | an..3 |
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