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User guide
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Created
January 2022
SNOMED CT is a standard for data elements used in the electronic exchange of clinical information.

This document is a guide to the use of the Ontology Web Language (OWL) in SNOMED CT. It includes detailed information about the structure, content and use of OWL reference sets. These OWL reference sets are used to distribute ontology reference information and the axioms that represent the formal logical definitions of SNOMED CT concepts.

The document also describes the background, design considerations, quality assurance and distribution format of the OWL reference sets.

Main sections:

• Design considerations for OWL reference sets

• Quality assurance

• OWL expression reference set specification
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