| Segment specification | DRD |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To specify the details of the data representation. |
| 覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧 |
| 010 |
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7512 | Structure component identifier | C | 1 | an..35 | |||
| 020 |
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7515 | Structure type code | C | 1 | an..3 | |||
| 030 |
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9169 | Data representation type code | C | 1 | an..3 | |||
| 040 |
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6174 | Size value | C | 1 | n..15 |
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