WebSQL is a SQL-like （） language for extracting information from the web. Its capabilities for performing navigation of web （） make it a useful tool for automating several web-related tasks that require the systematic processing of either ail the links in a （） ， all the pages that can be reached from a given URL through （） that match a ’ pattern， or a combination of both. WebSQL also provides transparent access to index servers that can be queried via the Common （） Interface.