Ideas from 'A Realistic Theory of Categories' by Roderick Chisholm [1996], by Theme Structure

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7. Existence / E. Categories / 3. Proposed Categories
Chisholm divides things into contingent and necessary, and then individuals, states and non-states
                        Full Idea: Chisholm's Ontological Categories: ENTIA - {Contingent - [Individual - (Boundaries)(Substances)] [States - (Events)]} {Necessary - [States] [Non-States - (Attributes)(Substance)]}
                        From: report of Roderick Chisholm (A Realistic Theory of Categories [1996], p.3) by Jan Westerhoff - Ontological Categories §01
                        A reaction: [I am attempting a textual representation of a tree diagram! The bracket-styles indicate the levels.]