The cell of an aspect, the reference time first: within a nonfinal subpart of the event time for the imperfective, whose meaning is the progressive's (35), (41), and around it for the perfective (36).
- cell Aspect.Perfectivity.imperfective = Allen.nonfinalSubinterval
- cell Aspect.Perfectivity.perfective = Aspect.ViewpointType.perfective.cell
Used by mem_cell_imperfective, mem_cell_perfective, denote, eventRel