 The ontologies in (a) span a wide spectrum of entities. They are meant to reflect a particular way in which an agent may carve up a system. Here “a system” can be the world, or a part or aspect of it, while the agent (or kind of agent) can be an animal species, a device, a theorist, etc. The list of basic entities includes individuals, relations (which come with roles attached to them), temporal and spacial locations, and various other things. Distinctive among them are the situations and infons. 