他们实际上并不关心混合内容、属性、语言独立性或者其他有用的 XML 特性，他们需要的是从服务器向客户机发送数据结构。
They didn't really care about mixed content, attributes, language independence, or other useful characteristics of XML -- they wanted to send data structures from the server to the client.
如果调用代码忽略api并处理库代码中的数据结构，那么将丧失这种独立性，因为库实现中的改变可能破坏行为失常的客户端。
If calling code ignored the API and manipulated data structures in the library code, this independence would be lost since a change in the library's implementation might break the misbehaving client.
为了实现数据对应用程序的独立性，应用程序自行定义所需要的局部逻辑数据结构。
In order to keep the data independence from application program, the necessary local logical data structure can be self-defined in every individual application program.
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