A hammer is the tool in a nail-driving activity, a pressure transmitter outputs data in a monitoring activity, a maintenance engineer replaces an instrument in a repair activity, a light sensor controls the level of illumination.
With OWL property chains, the right kind of participation can be secured for activities that count as realizations of 'potential' individuals. As in, a pump's primary function is realized in pumping activities, but only provided the pump is actually doing the pumping, acting as an "agent" or "subject".
