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<p>(CWA) or <a href="page.php?w=open_world_assumption">open world assumption</a> (OWA).  The OWA is often associated with <a href="page.php?w=Ontology">ontological</a> knowledge representation and the <a href="page.php?w=Semantic_Web">Semantic Web</a>.   Different systems exhibit a variety of approaches to <a href="page.php?w=negation">negation</a>.  As well as <a href="page.php?w=Logical_complement">logical</a> or <a href="page.php?w=bitwise_complement">bitwise complement</a>, systems may support existential forms of strong and weak negation including</p><p>
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