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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 （支持可擴展標記語言）
XML 是一種 標記語言 類似HTML語言
XML 是被用來 描述數據 的
XML 的標簽都沒被定義。你必須 對你的標簽進行定義
XML 使用 文件類型定義 (DTD) 或是 XML Schema（模型） 對數據進行描述
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.
可擴展標記語言（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 之間的主要區別 ]
XML was designed to carry data.
XML 是被用來傳送數據的

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 的產生是用來描述數據并關注數據的實質是什么
HTML was designed to display data and to focus on how data looks.
HTML 則是用來顯示數據，它所關注的是數據顯示的效果

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.
被設計成什么都不做的。

Maybe it is a little hard to understand, but XML does not DO anything. XML was created to structure, store and to send information.
這可能有一點難以理解~但是XML的確是不能輸出任何數據的~XML 是用與建立結構，存和發送信息的。