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| Report: | General Info | Constrained Elements |
| General Info | |
| Name | month_validity_optional |
| Expression | inv: month_validity = VALIDITY_KIND.optional implies (day_validity = VALIDITY_KIND.optional or day_validity = VALIDITY_KIND.disallowed) |
| Base Classes | Class |
| Constrained Elements | |
| Name | Type |
| C_DATE_TIME | Class |