(Q99566281)
Statements
if possible, add qualifiers to values: start date or end date. These properties usually have a "single best value constraint". (English)
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如果可能，为值添加修饰符：开始日期或结束日期。 这些属性通常具有“单一最佳值约束” (Chinese)
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the scheme of this property occasionally replaces identifiers with new values, e.g. identifier "zza" for entity "A" is replaced by "zzb", without "zza" later being used by another entity