The rules which define how SNOMED CT concepts may be defined are called the SNOMED CT concept model. The SNOMED CT concept model defines the permitted attributes and values that may be applied to each kind of concept. For example, concepts in the |clinical finding| hierarchy are permitted to have a |finding site| relationship, and the valid values of these relationships must belong to the |anatomical or acquired body structure| hierarchy. The SNOMED CT concept model provides the foundation for processing the clinical meanings recorded in clinical records and enables the appropriate use of clinical information for decision support and other analytics services.

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