流行的 Presentation Model （请参阅 参考资料） 提倡将应用程序的状态与业务逻辑分开放入模型层中，而模型层是从视图的 GUI 控件中分离出来的。
The popular Presentation Model (see Resources) advocates separating out the state and business logic of an application into a model layer that is separate from the GUI controls in the view.
此外，展示层可以透过服务(例如，服务)与中介层内的资料存取逻辑进行通讯。
Additionally, the presentation layer might communicate with the data access logic in the middle tier through a service such as a service.
这么做可以对资料存取和资料实体层进行逻辑划分。
This enables logical separation of the data access and data entity tiers.
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