The implementation class name is never used by other layers of the data access application; they always reference and use the user-defined data access interface.
数据访问应用程序的其他层不会使用实现类的名称；它们总是引用和使用用户定义接口。
The same method signatures appear on different services residing within each of the reference architecture layers.
相同的方法签名出现在每个参考架构层的不同服务上。
Certain reference architecture layers are redundant in that they perform no added value and merely "pass-through" data to the next immediate layer in the architecture.
有些参考架构层显得多余，它们没有任何附加值，仅仅向架构的另一个中间层“传递”数据。
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