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<a accesskey="3" href="page.php?w=Class_%28knowledge_representation%29&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=Knowledge_representation_and_reasoning">knowledge representation</a>, a <b>class</b> is a collection of individuals or individuals objects. A class can be defined either by <a href="page.php?w=Extensional_definition">extension</a> (specifying members), or by <a href="page.php?w=Intensional_definition">intension</a> (specifying conditions). According to the <a href="page.php?w=type-token_distinction">type-token distinction</a>, the ontology is divided into individuals, who are real worlds objects, or events, and types, or</p><p>
<a accesskey="3" href="page.php?w=Class_%28knowledge_representation%29&amp;p=2">3.Next</a>
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