They are relational databases that provide the strengths of the relational model and its set processing.
这两种都是关系型的数据库，因而包含了关系模型及其集合处理的长处。
That's all fine and good for the software model, but relational databases take a slightly different approach.
对于软件模型来说，这种表示方法非常合适，但是关系数据库采取的表示方法略有不同。
An application's reliance on XML documents for data exchange and relational databases for data persistence are characteristics of the application's business logic (that is, its model).
应用程序依赖XML文件来进行数据交换以及关系数据库来提供数据永久性都是应用程序业务逻辑(也就是其模式)的特征。
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