业务组件处理程序必须保留一个具体业务组件标识符的标识符。

What must be retained by the business component handler is the identifier of a concrete business component identifier.

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旧模式的注释和标识符仍然会保留。

The annotation and the identifiers for the old schema are retained too.

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事实上，项id是全局唯一标识符(universally unique identifier, UUID)，因此可以将一个存储库中创建的项复制到另一个存储库并保留其标识。

In fact, the item ids are universally unique identifiers (UUIDs), so that an item created in one repository can be replicated to another repository and retain its identity.

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