This specification defines a formal syntax for representing sets of clinical meanings using SNOMED CT expression constraints. Expression constraints are used for a range of purposes, including restricting the valid values in a health record, intensionally defining a reference set, or restricting the range of an attribute in the SNOMED CT concept model.
This specification defines the format used by SNOMED International's Machine Readable Concept Model (MRCM). The MRCM represents the SNOMED CT concept model in a form that can be read and tested by a computer. The MRCM is distributed as a set of reference sets with the SNOMED CT International Edition.