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SNOMED CT is a high-quality, comprehensive, international, logic-based r= eference terminology that is used to present clinically relevant informatio= n. It began with the union of NHS Clinical Terms V= ersion 3 and SNOMED RT; this provided the initial scope= which has since been updated to reflect contemporary clinical practice and= changes in medical technology.
Content development is provided by expert clinicians driven by the = requirements of user communities. This includes core content for use i= nternationally and content relevant to national extensions for local implem= entation.
Its logic-based definitions represent terminological knowledge, or what = is always true about the meaning of concepts. It consists of codes, th= at correspond to concepts, arranged in a polyhierarchical manner, as well a= s relationships between the concepts, which further define the meaning.
Description logic
Description logic (DL) is the formal foundation of meaning= in SNOMED CT. The way that concepts have been modeled in SNOMED CT permits= them to be represented using description logic. A DL reasoner is = used to classify SNOMED CT. The DL reasoner also helps test expressions for= subsumption and equivalence.
It supports semantic interoperability and multi-purpose use within elect= ronic health applications (primarily electronic health records or EHRs) and= has many advantages over other terminologies. They include: