    deferred class
    	CONTAINER [G]

    General
    	cluster: base
    	description:
    		"Data structures of the most general kind,
    		used to hold zero or more items."

    Ancestors
    	ANY

    Queries
    	changeable_comparison_criterion: BOOLEAN
    	has (v: G): BOOLEAN
    	is_empty: BOOLEAN
    	linear_representation: LINEAR [G]
    	object_comparison: BOOLEAN

    Commands
    	compare_objects
    	compare_references