(subclass ChristmasDay ChristianHoliday) | Media.kif 334-334 | Christmas day is a subclass of Christian holiday |
(subclass ChristmasDay Day) | Media.kif 335-335 | Christmas day is a subclass of day |
(subclass ChristmasDay FixedHoliday) | Media.kif 336-336 | Christmas day is a subclass of fixed holiday |
(subclass ChristmasDay (DayFn 25 December)) |
Media.kif 337-337 | Christmas day is a subclass of the day 25 |