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 all 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.