    deferred class
    	EV_SELECTABLE

    General
    	cluster: interface
    	description: "Abstraction for objects that may be selected."
    	keywords: "select, selected, selectable"

    Ancestors
    	EV_ANY*

    Queries
    	data: ANY
    	is_destroyed: BOOLEAN
    	is_selectable: BOOLEAN
    	is_selected: BOOLEAN

    Commands
    	copy (other: [like Current] EV_SELECTABLE)
    	destroy
    	enable_select
    	set_data (some_data: [like data] ANY)