hasPrimaryParticipant

Source ontology	Industrial Data Ontology
is primitive	true
natural language definition	If x 'has primary participant' y, then x is a realization of a disposition or role of y that is essential to the identification of x.
primitive rationale	The notion of primary participant is not defined.
usage note	Assume p is a pump, a an activity that realizes the function fp of p, and no subactivity x of a realizes fp (except for subactivities determined solely by restriction to a temporal sub-interval). For instance, the subactivity of the motor that drives the impeller realizes a function of the motor, but this is not by itself a realization of the function of the pump as a whole, hence the motor is not a 'primary participant'.
See also	primaryParticipantIn
Example	A pump is the performer in a pumping activity, a thermometer is the performer in a temperature measurement.

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Members