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Full Idea
Chisholm's Ontological Categories: ENTIA - {Contingent - [Individual - (Boundaries)(Substances)] [States - (Events)]} {Necessary - [States] [Non-States - (Attributes)(Substance)]}
Gist of Idea
Chisholm divides things into contingent and necessary, and then individuals, states and non-states
Source
report of Roderick Chisholm (A Realistic Theory of Categories [1996], p.3) by Jan Westerhoff - Ontological Categories §01
Book Ref
Westerhoff,Jan: 'Ontological Categories' [OUP 2005], p.14
A Reaction
[I am attempting a textual representation of a tree diagram! The bracket-styles indicate the levels.]