| Composite data element specification | C106 |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| Identification of a document/message by its number and eventually its version or revision. |
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| 010 | 1004 | Document identifier | C | 1 | an..35 | ||
| 020 | 1056 | Version identifier | C | 1 | an..9 | ||
| 030 | 1060 | Revision identifier | C | 1 | an..6 | ||
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