	/* TYPES

Type Heirarchy for Ecology Problems
Alan Bundy, 7.9.83 */


type_hierarchy.
%==============

entity <-> lifeform # moment # quantity # constant.
	% an entity is a lifeform or a moment or a quantity or a constant

lifeform <-> animal # vegetable.
	% a lifeform is animal or vegetable

quantity <-> temperature # biomass # clocktime # dimensionless.
	% a quantity is a temperature or a biomass or a clocktime or is dimensionless
