Expression Constraint Language

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The SNOMED CT Concept Model is the set of rules that determines the permitted sets of attributes and values that may be applied to particular types of concepts. There are also additional rules on the cardinality and grouping of each type of attribute. The SNOMED CT Concept Model includes the definition of the domain and range of each attribute. The domain is the set of concepts which are permitted to be used as the source of the attribute, while the range is the set of concepts which are permitted to be used as the target of the attribute. For example, the domain of the attribute

Scg expression
363698007 |Finding site|
 is the descendants and self of
Scg expression
404684003|Clinical finding|
, while the range is the descendants and self of
Scg expression
442083009 |Anatomical or acquired body structure|
.