获取校验和算法标识符，如果没有校验和，则返回全为零的GUID。

Gets the checksum algorithm identifier, or returns a GUID of all zeros if there is no checksum.

youdao

策略包括：一组规则、规则组合算法的标识符、一组义务和一个目标。

A policy consists of: a set of rules, an identifier for rule-combining algorithms, a set of obligations, and a target.

youdao

显然，像重命名一个Ruby源文件中的标识符这样的重构算法，需要知道标识符的位置在哪儿。

Obviously, a refactoring algorithm that, for instance, wants to rename an identifier in a Ruby source file needs to know where the identifier actually.

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