rm::data_structures::representation
	Classes
	CLUSTER
	ELEMENT
	ITEM
	Associations
	<unnamed>  [CLUSTER - ITEM]
	<unnamed>  [ITEM_TABLE - CLUSTER]
	<unnamed>  [ITEM_SINGLE - ELEMENT]
	<unnamed>  [ITEM_TREE - ITEM]
	<unnamed>  [ITEM_LIST - ELEMENT]
	Generalizations
	<unnamed>  [ELEMENT - ITEM]
	<unnamed>  [CLUSTER - ITEM]