what is text?

所有定义如下
The original words of something written or printed, as opposed to a paraphrase, translation, revision, or condensation.
原文：与意译，翻译，修订或缩写相对的手写或印刷的原文
The words of a speech appearing in print.
演讲稿：印刷出的演讲词
The body of a printed work as distinct from headings and illustrative matter on a page or from front and back matter in a book.
正文：与题目和解释性文字或封面与封底相区别的印刷著作主体

What is text mining? What are its potential applications and limitations?

Text Mining is the discovery by computer of new, previously unknown information, by automatically extracting information from different written resources. A key element is the linking together of the extracted information together to form new facts or new hypotheses to be explored further by more conventional means of experimentation.

Text mining is different from what we're familiar with in web search. In search, the user is typically looking for something that is already known and has be