rm::data_structures::item_structure
	Classes
	ITEM_LIST
	ITEM_SINGLE
	ITEM_STRUCTURE
	ITEM_TABLE
	ITEM_TREE
	Constraints
	Column_names_valid
	Data_exists
	events_exists
	Interval_start_time_valid
	Is_null_valid
	Items_non_empty
	Math_function_validity
	Names_valid
	Null_flavor_indicated
	Null_flavour_valid
	Offset_validity
	origin_exists
	periodic_validity
	Time_exists
	unnamed1
	unnamed1
	unnamed1
	unnamed1
	unnamed1
	unnamed1
	unnamed1
	unnamed1
	Valid_structure
	Valid_structure
	Width_valid
	Associations
	<unnamed>  [HISTORY - ITEM_STRUCTURE]
	<unnamed>  [EVENT - ITEM_STRUCTURE]
	Dependencies
	<unnamed>  [representation - ITEM_STRUCTURE]
	Generalizations
	<unnamed>  [ITEM_STRUCTURE - DATA_STRUCTURE]
	<unnamed>  [ITEM_TREE - ITEM_STRUCTURE]
	<unnamed>  [ITEM_LIST - ITEM_STRUCTURE]
	<unnamed>  [ITEM_SINGLE - ITEM_STRUCTURE]
	<unnamed>  [ITEM_TABLE - ITEM_STRUCTURE]