XML
本文是关于XML的介绍，试着翻译了下，不足之处望多多包涵。
XML
可扩展标记语言（XML）是一组机读形式下有规则的文本编码。它依据W3C标准，在XML1.0规格被定义出来，有各种相关说明，全部都是免费开发标准。
XML的设计目标是着重在互联网上实现简易性、普遍性、可用性。它在语言世界里支持Unicode的一种文本数据格式。尽管XML的设计焦点在文件，广泛的用于任意数据结构的表现，例如在网络服务。
许多应用程序接口（APIs）开发出来让软件开发者用来处理XML数据和多模式系统的存在帮助基于XML语言的定义。
在2009年，100多种基于XML语言开发出来，包括RSS、Atom、SOAP和XHTML。基于XML格式为办公生产工具变成了默认的选择，包括Microsoft、OpenOffice.org和Apple's iWork。
原文：
XML
Extensible Markup Language (XML) is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards.
The design goals of XML emphasize simplicity, generality, and usability over the Internet.It is a textual data format with strong support via Unicode for the languages of the world. Although the design of XML focuses on documents, it is widely used for the representation of arbitrary data structures, for example in web services.
Many application programming interfaces (APIs) have been developed that software developers use to process XML data, and several schema systems exist to aid in the definition of XML-based languages.
As of 2009, hundreds of XML-based languages have been developed,including RSS, Atom, SOAP, and XHTML. XML-based formats have become the default for most office-productivity tools, including Microsoft Office (Office Open XML), OpenOffice.org (OpenDocument), and Apple's iWork.
XML
