The application data section contains the actual data sent from one program to another, and its content and structure are defined by the applications that use it.
应用程序数据部分包含从一个程序发送到另一程序的真实数据，且其内容和结构由使用它的应用程序定义。
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.
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。
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