Full Idea
In the 'laws' world view, events are the basic ontological unit and properties are parasitic upon them. Properties exist only in virtue of their instantiation in events. Properties are categorical, because they are only manifested in the present.
Gist of Idea
In the 'laws' view events are basic, and properties are categorical, only existing when manifested
Source
Stephen Mumford (Dispositions [1998], 10.2)
Book Reference
Mumford,Stephen: 'Dispositions' [OUP 1998], p.218
A Reaction
Mumford rejects this view, and I am with him all the way. The first requirement is that properties be active, and not inert. See Leibniz on this.