According the structure of the state_change, there must be three kinds of state_change, depending on the kinds of world one is concerned with. There are abstract, mental and ideal worlds, hence there are abstract, mental and ideal states (and state_change). A state is an intentional object because it is a mental view on a world. The type of the considered world, and of the corresponding state, is determined by the focussed objects: if the focussed objects are ideal objects, e.g. the social status, the medical discipline, then the related state is a cultural state; if the focussed objects are physical objects, the state is physical; and for intentional object, the state is mental. Every state (or state change) is a mental view on objects, and every types of objects can be concerned. Hence, a physical state is not defined by only physical objects, but also by ideal or cultural objects. The only thing is that the focussed objects (bound the state by the "consists_of" relation) must be physical for the state to be physical. The reason of this fact is that a physical state is not a physical object, but a mental state about physical objects, a representation, or an intentional object.

[state:_x]- ;;(state_of)-->[substratum] (attr)-->[state_evolution_attr]--(val_qual)-->[state_evolution_val] %