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Describes the structure of a Variable. This is the applied expression of a data item within a data set and maps to the GSIM ImplementedVariable. In addition to the standard name, label, and description, includes a reference to a source parameter, represented variable, conceptual variable, universe, concept, question, source variable, and embargo information. It identifies the normal source of the data in the variable, the unit of analysis, whether the variable provides temporal or geographic information, or serves as a weight for other variables in the data, and provides a full description of its representation.