| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| Identification of a type of document/message by code or name. Code preferred. |
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| 010 | 1001 | Document name code | C | 1 | an..3 | ||
| 020 | 1131 | Code list identification code | C | 1 | an..17 | ||
| 030 | 3055 | Code list responsible agency code | C | 1 | an..3 | ||
| 040 | 1000 | Document name | C | 1 | an..35 | ||
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