You can use Business Objects, extensions of Service Data Objects (SDO), to provide an abstraction layer for data access.
可以使用业务对象（服务数据对象 (SDO) 的扩展）为数据访问提供抽象层。
Model is also pretty easy to understand: business processes and objects exist in this layer.
模型也是很容易理解的：业务逻辑和对象都处于这个层。
The SOA approach is to separate the layers with consumers interacting with the business objects through the service layer rather than directly.
SOA方法分离各个层，消费者通过服务层与业务对象进行交互，而不是直接进行交互。
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