Identifier at the source system for the represented-variable. Used during import to determine if the entity already exists in the target system (update) or is new (create). Must remain stable in the source system for the same entity. The name of the represented variable Detailed description of how the variable is represented The formal definition of the variable, capturing the meaning of what is measured. Corresponds to the GSIM Concept. Reference to EnumeratedValueDomain (has value domain) Reference to ConceptualVariable (represents concept)