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Semantic enrichment for medical ontologies
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Taxonomies are commonly used for organizing knowledge, particularlyin biomedicine where the taxonomy of living organisms and theclassification of diseases are central to the domain. Theprinciples used to produce taxonomies are either intrinsic(properties of the partial ordering relation) or added to makeknowledge more manageable (opposition of siblings and economy). Theapplicability of these principles in the biomedical domain ispresented using the Unified Medical Language System (UMLS) andissues raised by the application of these principles areillustrated. While intrinsic principles are not challenged, weargue that the opposition of siblings brings to bear excessiveconstraints on a domain ontology and that the adverse effects ofeconomy may outweigh its benefits. The two-level structure used inthe UMLS is discussed.