| title  | 
                    
                       A string. 
                      The title to be displayed in the header of the column. If this field is
                        empty, a default title is computed using the property specifications. 
                      This field is optional. 
                     | 
                  
                  
                    | style  | 
                    
                       A string. 
                      Indicates the CSS styles for the table cells content. The possible values are: 
                      By default, the value is  "nowrap". 
                      This field is optional. 
                     | 
                  
                  
                    | separator  | 
                    
                       A string or null. 
                      Defines a separator when several properties are specified in a column.  
                          - When a string is specified, this is the separator to be used (mode
                            ALL).
 
                          null indicates that only the first not empty property
                            must be displayed (mode ONE). 
                         
                      This field is optional. 
                     | 
                  
                  
                    | showIcon  | 
                    
                       A Boolean. 
                      Specifies if the object icon and indent must be displayed. By default, the
                        value is false. 
                      This field is optional. 
                     | 
                  
                  
                    | properties  | 
                    
                       List of  property specification 
                      One or more properties to be displayed in the column. 
                     |