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Reference.org
Ontology components
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<p>Contemporary <a href="/facts/Ontology_(information_science)/SQlhl6lp">ontologies</a> share many structural similarities, regardless of the <a href="/facts/Ontology_language/yXLTb2z3">ontology language</a> in which they are expressed. Most ontologies describe individuals (instances), classes (concepts), attributes, and relations. </p>