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 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“有效起始于”的值给出了相关地域（领地或者集团）有效起始年。
The value of the datatype property "validSince" gives the starting year of validity of the area (territory or group) it is associated with.
在一个地域(领地或者集团)随时间发生了变化并保留了名称的情况下，本体将应用后缀年份固定这个名称(比如“粮农组织2006”)区分这两个地域。
In cases where an area (territory or group) changed in time but kept the name, the ontology differentiates the two areas by sub-fixing the name of the obsolete one with the year (e.g. "FAO 2006").
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