Describes a RepresentedVariable contained in the RepresentedVariableScheme. In addition to the standard name, label, and description a RepresentedVariable contains a reference to the Concept and Universe (or ConceptualVariable) as well as the representation of the RepresentedVariable. Representation may be provided in-line or by reference to a managed representation. RepresentedVariables are the core reusable parts of a Variable. RepresentedVariable maps to the GSIM Represented Variable. In addition to the standard name, label, and description