| Data element specification | 0001 |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| Coded identification of the agency controlling a syntax and syntax level used in an interchange. Notes: 1. a3, upper case, Controlling Agency (e.g. UNO=UN/ECE) and a1 stating level (e.g. A) (which together give UNOA). |
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