ITS定义了一些标记，可以包括在模式和文档中来说明和国际化有关的用意。
ITS defines several tags which you can include in your schemas and documents to highlight your intent with respect to internationalization.
识别文本中的特定模式并进行标记通常十分有用。
It is often useful to recognize a particular pattern in text and mark it up.
向用户显示与模式对应的标记(XML描述器中的内容元素)。
The markup (the content element in the XML descriptor) corresponding to the mode is shown to the user.
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