code: def listDataType(self, dataType="", dataset=""):
          
          conn = self.dbi.connection()
          try:
              if dataset and dataType:
                  dbsExceptionHandler('dbsException-invalid-input',
                      "DBSDataType/listDataType. Data Type can be only searched by data_type or by dataset, not both.")
              else:
                  result = self.dataType.execute(conn, dataType, dataset)
                  return result
          finally:
              if conn:
                  conn.close()
docs: List data-type/primary-ds-type