The table column in which hierarchical data is displayed.
- macOS 10.0+
Each level of hierarchical data is indented by the amount specified by the
indentation property (the default is
16), and decorated with the indentation marker (disclosure triangle) on rows that are expandable. Outline table column data is archived with the rest of the outline view’s state information.
Attempts to set the value of this property to
nil are silently ignored.