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                           description: 
                           
                           A value representing the specific kind of Entity the instance represents.
                           
                           
                              Examples: A medical building, a Doberman Pinscher, a blood collection tube, a tissue biopsy.
                           
                           
                           
                              Rationale: For each Entity, the value for this attribute is drawn from one of several coding
                              systems depending on the Entity classCode, such as living subjects (animal and plant
                              taxonomies), chemical substance (e.g., IUPAC code), organizations, insurance company,
                              government agency, hospital, park, lake, syringe, etc. It is possible that Entity.code
                              may be so fine grained that it represents a single instance. An example is the CDC
                              vaccine manufacturer code, modeled as a concept vocabulary, when in fact each concept
                              refers to a single instance.