| A calendar date is a time point in which month, day and year have been specified |
| •owl:Thing |
| •PHILOSURFICAL-ENTITY |
| •CRM-ENTITY |
| •TIME-SPECIFICATION |
| •TIME-POINT |
| •CALENDAR-DATE |
| TIME-POINT |
| YEAR-OF ONLY YEAR-IN-TIME |
| MONTH-OF ONLY MONTH-IN-TIME |
| DAY-OF ONLY DAY-IN-TIME |
Class(CALENDAR-DATE partial TIME-POINT
restriction(YEAR-OF allValuesFrom(YEAR-IN-TIME))
restriction(MONTH-OF allValuesFrom(MONTH-IN-TIME))
restriction(DAY-OF allValuesFrom(DAY-IN-TIME)))