    deferred class
    	BAG [G]

    General
    	cluster: base
    	description:
    		"Collections of items, where each item may occur zero
    		or more times, and the number of occurrences is meaningful."

    Ancestors
    	COLLECTION* [G]

    Queries
    	changeable_comparison_criterion: BOOLEAN
    	extendible: BOOLEAN
    	has (v: G): BOOLEAN
    	is_empty: BOOLEAN
    	is_inserted (v: G): BOOLEAN
    	linear_representation: LINEAR [G]
    	object_comparison: BOOLEAN
    	occurrences (v: G): INTEGER_32
    	prunable: BOOLEAN

    Commands
    	compare_objects
    	compare_references
    	extend (v: G)
    	fill (other: CONTAINER [G])
    	prune (v: G)
    	prune_all (v: G)
    	put (v: G)
    	wipe_out