The ATK interface implemented by container objects whose Atk.Object children can be selected.

This should be implemented by UI components with children which are exposed by Object.RefChild and Object.NChildren, if the use of the parent UI component ordinarily involves selection of one or more of the objects corresponding to those AtkObject children - for example, selectable lists.

Note that other types of "selection" (for instance text selection) are accomplished a other ATK interfaces - Atk.Selection is limited to the selection/deselection of children.