前言XML是eXtensible Markup Language(可扩展标记语言)的缩写，是SGML(标准通用化标记语言）的一个子集用于提供数据描述格式适用于不同应用程序间的数据交换，而且这种交换不以预先定义的一组数据结构作为前提，增强了可扩展性。一、XML文档结构一个基本的XML文档通常由序言...

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