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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

  1. 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).
  2. The standard way to represent an intensional definition of a subset of SNOMED CT concepts is to use the  SNOMED CT expression constraint language.
  3. 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.  

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