它判断多个记录中的姓名是同一身份的变体，还是不同的身份。
It determines if multiple records with name variations belong to the same or different identity.
模式的文档中通常还会记录下模式的多种变体，每种变体都各有不同的优势与缺点。
A pattern often also documents many variations of itself that may all have different advantages and disadvantages.
而且，取决于应用程序日志中记录的是事件的哪个变体，用户也可以看到不同的症状。
Also, depending on which variation of this event is logged in the application log, the user might see a different symptom.
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