Modifying the mapping definition, rather than requiring changes in application code, often handles minor changes in the XML document structure.
修改映射定义(而不需要改变应用程序代码)通常处理XML文档结构中微小的变化。
The Protocol is described with DTD(Document Type Definition)style. We analyze the questions which should be paid attention to when designing such kind of application.
程序代码只能访问头文件，该文件仅仅声明数据 类型的 描述符指针以及作用于该数据 类型的操作。
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