After it has determined the item type, your connector will need to construct the item in the appropriate class and return it to the user.

在判断条目类型之后，连接器需要在适当的类中构造条目，并将它返回给用户。

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For each item type there is a separate item handle class used to represent references to items of that type; item handles consist of item type and item id.

对于每个项类型，存在一个单独的项句柄类，用于表示对该类型的项的引用；项句柄由项类型和项id组成。

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When overridden in a derived class, returns a value indicating whether the context item manager contains an item of the specified type.

当在派生类中重写时，返回一个值，该值指示上下文项管理器是否包含指定类型的项。

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