A subset definition in which the membership is represented by a set of rules. These
rules specify the necessary conditions that must be met for inclusion within the subset.
Notes
- An extensional definition of the members of subset of SNOMED CT concepts can be represented
as a set of rules (e.g. concepts that are types of respiratory disease characterized
by edema).
- The standard way to represent an intensional definition of a subset of SNOMED CT concepts
is to use the
SNOMED CT expression constraint language.
- The standard way to distribute an intensional definition of a subset of SNOMED CT
concepts is as a row in a
query specification reference set containing the expression constraint.