The value of the datatype property "validUntil" gives the last year of validity of the area (territory or group) it is associated with.
数据型属性“有效期至”值给出了与之相关的地域（领地或者集团）的有效期的最后一年。
The year indicates the beginning of validity of that particular area.
年份表明该特定地域有效性的起始。
The value of the datatype property "validSince" gives the starting year of validity of the area (territory or group) it is associated with.
数据型属性“有效起始于”的值给出了相关地域（领地或者集团）有效起始年。
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