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A Taxonomy is a ClassificationScheme that typically includes the salient concepts of a domain of interest, plus, minimally, a binary `broader than'/`narrower than' relation by which the concepts are linked. The `broader than'/`narrower than' relation is usually conceived as set- or class-based subsumption, but taxonomies are notorious for conflating the set membership and set subsumption (i.e., subset/superset) relations into a single `IS-A' relation. Some taxonomies include additional binary relations, such as `subpart'/`superpart'.
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