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Related to reference sets, the ECL includes the ability to refer to a set of concepts that are referenced by members of a reference set. Additionally, it includes a range of features, such as refinements, disjunction, and conjunction, which support specialized queries. The memberOf function evaluates to the set of concepts that are referenced by the given reference set. For example, the following expression constraint is satisfied by the set of concepts which are members of

• memberOf

  Concept

  scg-expression

  t 649999999104

  |Example

  problem

  list

  simple

  reference

  set|

The diagram below illustrate how reference sets can be for specifying queries.