如果你使用application/xhtml+xml作为MIME类型来定义一个XHTML文档，Internet Explorer将提醒你下载这个文件，因为它不知道怎样处理这一类型的文件。
If you serve an XHTML document with a MIME type of application/xhtml+xml, Internet Explorer will prompt you to download the file, because it doesn't know how to handle the file.
XML是包含类似于HTML标签的一个文本文件，在这个文件中定义了一个树型结构来描述它所保存的数据。
XML is similar to HTML tag that contains a text file, in this document defines a tree structure to describe it is to preserve data.
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