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.
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