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| Report: | General Info | Constrained Elements |
| General Info | |
| Name | Null_flavour_valid |
| Expression | inv: is_null implies terminology(Terminology_id_openehr).has_code_for_group_id (Group_id_null_flavour, null_flavor.defining_code) |
| Base Classes | Class |
| Constrained Elements | |
| Name | Type |
| ELEMENT | Class |