| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To specify a part of a country (eg county or part of a city). |
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| 010 | 3229 | Country sub-entity name code | C | 1 | an..9 | ||
| 020 | 1131 | Code list identification code | C | 1 | an..17 | ||
| 030 | 3055 | Code list responsible agency code | C | 1 | an..3 | ||
| 040 | 3228 | Country sub-entity name | C | 1 | an..70 | ||
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