The next version should focus less on the data access and business logic tiers and more on the service interface.
下一版本应该把重点放在服务接口，而不是数据访问和业务逻辑层。
A service provider node can represent the services of a business entity or it can simply represent the service interface for a reusable subsystem.
服务提供者节点能代表商业实体的服务，或者它甚至能代表可重用的子系统的服务接口。
A good service interface is focused on providing business value.
好的服务接口以提供业务价值为重点。
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