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Abstract : The UMLS Metathesaurus is a syntactically uniform, concept-based, semantically enhanced representation of many of the world’s authoritative biomedical vocabularies. As vocabularies become standards for reimbursement, reporting, interoperation, and use by applications, the vocabulary obtained from the Metathesaurus must be consistent with that obtainable from each vocabulary’s authority. In this paper, we describe the new release format of UMLS Metathesaurus focused on major changes. Effective with the first 2004 release, the Metathesaurus represents new and updated sources “transparently??both users and applications are able to “see?each vocabulary in the Metathesaurus without any of the small losses of information introduced by abstractions used in previous versions. Thus, the Metathesaurus can continue to provide its many semantic and lexical value-added features while guaranteeing that original sources will be “visible”in intact form. keyword : Unified Medical Language System, Medical Informatics, Controlled Vocabulary, Information Systems, Metathesaurus
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