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What is XML? [ 什么是XML？ ]
XML stands for EXtensible Markup Language
XML is a markup language much like HTML
XML was designed to describe data
XML tags are not predefined. You must define your own tags
XML uses a Document Type Definition (DTD) or an XML Schema to describe the data
XML with a DTD or XML Schema is designed to be self-descriptive
XML is a W3C Recommendation
XML 就是 EXtensible Markup Language （支持可擴(kuò)展標(biāo)記語言）
XML 是一種 標(biāo)記語言 類似HTML語言
XML 是被用來 描述數(shù)據(jù) 的
XML 的標(biāo)簽都沒被定義。你必須 對(duì)你的標(biāo)簽進(jìn)行定義
XML 使用 文件類型定義 (DTD) 或是 XML Schema（模型） 對(duì)數(shù)據(jù)進(jìn)行描述
XML中加入 DTD 或者XML Schema 可以被用來 自我描述
XML 是W3C組織（World Wode Web Consortium）所推薦的

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XML is a W3C Recommendation [ XML是 W3C 推薦的 ]
The Extensible Markup Language (XML) became a W3C Recommendation 10. February 1998.
可擴(kuò)展標(biāo)記語言（XML）在1998年2月10日被W3C 所推薦

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The main difference between XML and HTML [ XML 和HTML 之間的主要區(qū)別 ]
XML was designed to carry data.
XML 是被用來傳送數(shù)據(jù)的

XML is not a replacement for HTML.
XML 還不能代替 HTML 的位置 XML and HTML were designed with different goals:
XML 和HTML有各自不同的用途：

XML was designed to describe data and to focus on what data is.
XML 的產(chǎn)生是用來描述數(shù)據(jù)并關(guān)注數(shù)據(jù)的實(shí)質(zhì)是什么
HTML was designed to display data and to focus on how data looks.
HTML 則是用來顯示數(shù)據(jù)，它所關(guān)注的是數(shù)據(jù)顯示的效果

HTML is about displaying information, while XML is about describing information.
HTML 是用來顯示信息~而XML則是來描述信息的

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XML does not DO anything [ 什么也不做 ]
XML was not designed to DO anything.
被設(shè)計(jì)成什么都不做的。

Maybe it is a little hard to understand, but XML does not DO anything. XML was created to structure, store and to send information.
這可能有一點(diǎn)難以理解~但是XML的確是不能輸出任何數(shù)據(jù)的~XML 是用與建立結(jié)構(gòu)，存和發(fā)送信息的。