| (subclass ChristmasDay ChristianHoliday) | Media.kif 334-334 | ChristmasDay 是 ChristianHoliday 的 subclass |
| (subclass ChristmasDay Day) | Media.kif 335-335 | ChristmasDay 是 日 的 subclass |
| (subclass ChristmasDay FixedHoliday) | Media.kif 336-336 | ChristmasDay 是 固定假期 的 subclass |
| (subclass ChristmasDay (DayFn 25 December)) |
Media.kif 337-337 | ChristmasDay 是 25 day 的 subclass |
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