Books on Amazon
categorical / Place: sentences, not entities - Martin: "purely categorical": only the existence of the bearer of properties - and spatio-temporal relations between its parts - PlaceVsArmtrong: then it microstructure is not "purely categorical" but only their existence, and not existence of the parts.
AR II = Disp
D. M. Armstrong
Dispositions, Tim Crane, London New York 1996
What is a Law of Nature? Cambridge 1983