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An Experimental Platform for Approximate Databases

We have implemented an experimental platform for approximate knowledge databases based on a semantics inspired by rough sets called the Rough Knowledge Database (rkdb). The implementation is based upon the use of a standard sql database to store logical facts, augmented with several query interface layers implemented in Java through which extensional and intensional approximate logical formula queries, approximate fixpoint formula queries, and local closed world queries can be evaluated. Designing the database, entering data, and querying can all be accomplished in an accessible way through the Graphical Database Design user interface.