in a group but consist of a single relationship. Another convention for SNOMED CT international edition is to avoid creating intermediate primitive concepts (unless medically necessary and impossible to define with existing concept model). An intermediate primitive (=not defined) concept is a non-defined concept that has children concepts and parent concepts. This convention is related to the use of description logic to facilitate terminology maintenance. Because primitive concepts can not be processed by the description logic classifier, the maintenance of such concepts relies solely on human editors. Adding new intermediate primitive concepts requires changes to all affected concepts and is demanding in terms of terminology maintenance. See also CDISC Clinical Care Classification System DOCLE EN 13606 MEDCIN MedDRA Omaha System ICD11 Foundational Model of Anatomy Notes References External links SNOMED International website SNOMED International's online browsers for SNOMED CT US National Library of Medicine SNOMED CT resources NHS Digital SNOMED CT resources Veterinary Extension of SNOMED CT Medical classification Diagnosis classification Nursing classification Standards for electronic health records Anatomical terminology