In one embodiment, prior to similarity measure computation, concept expansion is applied to an original ontology to generate an expanded ontology having the original concepts plus one or more pseudo-concepts, wherein at least one original concept is defined using a hierarchy of (possibly transitive) properties. As a result, the similarity measure computation can produce results that are better than those produced using conventional techniques. In one implementation, the similarity measure computation involves combining two similarity results: a first similarity result corresponding to common semantics found in the two concepts and a second similarity result corresponding to dissimilar semantics found in the two concepts.
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