25. The method of claim 24 , further comprising monitoring said web page on an ongoing basis to alert when at least one of the web page structure, URL structure, and said content of said web page has changed.
24. The method of claim 22 , wherein said generating said document feature vector comprises generating said document feature vector of said URL or of said content of said web page prior to said receiving said URL for said web page, wherein said method further comprises: storing said document feature vector of said URL or of said content of said web page and retrieving the document feature vector from said database in real time in response to said receiving said URL for said web page.