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<p>semantics, formal definitions for concepts such as an <a href="page.php?w=Is-a">Is-A relation</a>. KL-ONE and languages that were influenced by it such as <a href="page.php?w=LOOM_%28ontology%29">Loom</a> had an automated reasoning engine that was based on formal logic rather than on IF-THEN rules. This reasoner is called the classifier. A classifier can analyze a set of declarations and infer new assertions, for example, redefine a class to be a subclass or superclass of some other class that wasn't formally specified. In this way the classifier</p><p>
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