| Segment specification | CDS |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To identify a code set and to give its class and maintenance operation. |
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| 010 |
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C702 | Code set identification | M | 1 | |||||||||
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C | 1 | an..4 | |||||||||
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C | 1 | an..17 | |||||||||
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C | 1 | an..3 | |||||||||
| 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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