Scope note:
This property defines the kind of objects used in an E7 Activity, when the specific instance is either unknown or not of interest, such as use of "a hammer".
Examples:
- at the Battle of Agincourt (E7), the English archers used object of type long bow (E55)
In First Order Logic:
P125(x,y) ⊃ E7(x)
P125(x,y) ⊃ E55(y)