业务项用于捕获流经流程的信息类型或数据对象。

A business item captures a type of information or a data object that flows through the process.

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activitystreamsentry类也包括了用于给项添加作者、对象和动词的简单帮助器方法，可以保证这些值的变量类型是正确的。

The ActivityStreamsEntry class also includes simple helper methods for adding an author, objects, and verbs to the entry, ensuring the proper variable type of these values.

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复杂项类型的逻辑模型还可以包括helper类，并且项可以具有引用Helper对象的属性。

The logical model for complex item types can also include helper classes, and items can have properties that refer to helper objects.

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