举例来说，让我们来考察一个控制器方法，它负责保存业务逻辑中的某一模型对象。
As an example, consider a controller method that manages saving a simple model object.
它们还包含了对象的概念，并且可以扩展数据库服务器的功能，更好地配合您的业务模型。
They also include object concepts and the capabilities to extend the database server capabilities to better fit your business model.
通过使用XML数据模型，就可以取消整个数据对象包装器层次结构，让开发人员将注意力集中在业务逻辑上，而不会为业务数据管理分心。
Using the XML data model, the whole hierarchy of data object wrappers can be eliminated, leaving the programmer to focus on the business logic rather than on the business data management.
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