| Composite data element specification | S009 |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| Identification of the type, version etc. of the message being interchanged. |
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| 010 | 0065 | Message type | M | 1 | an..6 | ||
| 020 | 0052 | Message version number | M | 1 | an..3 | ||
| 030 | 0054 | Message release number | M | 1 | an..3 | ||
| 040 | 0051 | Controlling agency | M | 1 | an..2 | ||
| 050 | 0057 | Association assigned code | C | 1 | an..6 | ||
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