XML（eXtensible Markup Language）即可扩展标记语言，它与HTML一样，都是SGML(Standard Generalized Markup Language,标准通用标记语言)。Xml是Internet环境中跨平台的，依赖于内容的技术，是当前处理结构化文档信息的有力工具。扩展标记语言XML是一种简单的数据存储语言，使用一系列简单的标记描述数据，而这些标记可以用方便的方式建立，虽然XML占用的空间比二进制数据要占用更多的空间，但XML极其简单易于掌握和使用。 -XML (eXtensible Markup Language) to Extensible Markup Language, which is like HTML are SGML (Standard Generalized Markup Language, Standard Generalized Markup Language). Xml is a cross-platform Internet environment, and dependent on the content of technology, is currently structured to deal with a powerful tool to document information. Extensible Markup Language XML is a simple data storage language, using a series of simple markers to describe the data, and these markers can be used to facilitate the establishment of the way, although the XML space than binary data to occupy more space, but XML is extremely simple and easy to master and use.