相反，它只需要程序员将属性标记为持久性的，并识别出能代表对象唯一标识符(或者主键)的属性。

Instead, it requires the developer only to denote the attributes to be persisted and to identify the attribute to represent the object's unique identifier (or primary key).

youdao

这样的Jazz项目应该包含有一个“标识符”属性，通过它来识别相应的外部性对象。

And such Jazz items should include an "identifier" property by which corresponding external objects are identified.

youdao