SNOMED CT expression constraint

A computable rule that is used to define a set of clinical meanings.

SNOMED CT expression constraints are defined using the expression constraint language (ECL).
Expression constraints can be used for a variety of purposes including:
- Specifying value set bindings that constrain the values that can be entered in a particular data entry context.
- Representing an intensional subset definition, which may be used to determine the membership of a reference set
- Querying electronic health records for record entries that contain specified sets of concepts and/or expressions
- Defining the SNOMED CT concept model by specifying the sets of concepts in a | concept model domains| and the range of values applicable to each attribute.

Related Links