    # KEHOME/knowledge/theory/Sowa/ontology.html
    # Jan/22/2003

    # http://www.jtsowa.com/ontology/toplevel.htm

    # attributes
    #===========
    attribute isg
    	physical, abstract,
    	independent, relative, mediating,
    	continuant, occurrent

    # lattice
    #========
    Sowalat is begin lattice
    Entity
    /	Physical	# space, time
    /	Abstract	# not space, not time
    Entity
    /	Independent	# one entity
    /	Relative	# two entities
    /	Mediating	# three or more entities
    Entity
    /	Continuant	# not time
    /	Occurrent	# time

    Entity
    /   Physical
    //	Actuality
    ///	    Object
    ///	    Process
    //	Prehension
    ///	    Juncture
    ///	    Participation
    //	Nexus
    ///	    Structure
    ///	    Situation
    /   Abstract
    //	Form
    ///	    Schema
    ///	    Script
    //	Proposition
    ///	    Description
    ///	    History
    //	Intention
    ///	    Reason
    ///	    Purpose
    end lattice Sowalat

    # definitions
    #============
    Absurdity is bottom
    Entity is top
    	Physical is Entity with physical
    	Abstract is Entity with abstract

    	Independent is Entity with independent
    	Relative is Entity with relative
    	Mediating is Entity with mediating

    	Continuant is Entity with continuant
    	Occurrent is Entity with occurrant

    Actuality is Physical with independent
    	Object is Actuality with continuant
    	Process is Actuality with occurrent
    Prehension is Physical with relative
    	Juncture is Prehension with continuant
    	Participation is Prehension with occurrent
    Nexus is Physical with mediating
    	Structure is Nexus with continuant
    	Situation is Nexus with occurrent

    Form is Abstract with independent
    	Schema is Form with continuant
    	Script is Form with occurrent
    Proposition is Abstract with relative
    	Description is Proposition with continuant
    	History is Proposition with occurrent
    Intention is Abstract with mediating
    	Reason is Intention with continuant
    	Purpose is Intention with occurrent

    # KE output
    #==========
    set hfocus = Entity