| Composite data element specification | C778 |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To identify the position of an object in a structure containing the object. |
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| 010 | 7164 | Hierarchical structure level identifier | C | 1 | an..35 | ||
| 020 | 1050 | Sequence position identifier | C | 1 | an..10 | ||
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