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ConceptBase
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<p>ConceptBase (a.k.a. ConceptBase.cc) is a deductive and object-oriented <a href="/facts/Database_management_system/VYcpkevb">database management system</a> developed at <a href="/facts/University_of_Sk%25C3%25B6vde/F80wbGJ3">University of Skövde</a>. Earlier development was done at <a href="/facts/University_of_Passau/2bDMUQjg">University of Passau</a> (1987-1992), <a href="/facts/RWTH_Aachen/m85nNsAH">University of Aachen</a> (1992-2003), and <a href="/facts/University_of_Tilburg/FEqJtlKL">University of Tilburg</a> (1997-2013). It is mainly used for conceptual modeling and <a href="/facts/Metamodeling/lA2nkA6J">metamodeling</a> in the domain of <a href="/facts/Software_engineering/KX6cE9kz">software engineering</a> and related domains. ConceptBase.cc is free and open-source software. </p><p>ConceptBase combines the following features: </p> <ul><li>Object-oriented concepts such as classes and inheritance</li> <li>Deductive rules evaluated by a <a href="/facts/Datalog/67jbYWDb">Datalog</a> engine</li> <li>Active rules conforming to the <a href="/facts/Event_condition_action/aPeC57Kd">event condition action</a> (ECA) paradigm</li> <li>Recursive function definitions</li> <li><a href="/facts/Metamodeling/lA2nkA6J">Metamodeling</a> with arbitrarily many abstraction levels (metaclasses, meta metaclasses)</li></ul> <p>ConceptBase implements <a href="http://conceptbase.sourceforge.net/userManual80/cbm002.html#sec3">O-Telos</a>, which is a variant of the knowledge representation Telos. </p>