The non-containment item references in the logical model are mapped in the storage model to fields containing item handles.
逻辑模型中的非包含项引用在存储模型中映射到包含项句柄的字段。
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。
ItemFinders facilitate browsing because they can retrieve all of the items contained within a Folder or WorkQueue, as well as any additional item handles that have been requested.
ItemFinders有助于浏览，因为它们可以检索一个Folder或WorkQueue中包含的所有条目，以及请求的任何其他条目句柄。
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