This property associates a publication, i.e. an instance of F3 Manifestation Product Type, with an instance of E60 Number, which
denotes the number of physical units all exemplars of that publication should consist of, as long as they are recognised as complete
exemplars of that publication. Typically, this property is observed on one exemplar of a publication, and extrapolated to all other
exemplars of the same publication. This logical inference is an induction along the path that can be modelled as: F3 Manifestation Product
Type R7i has example F5 Item P57 has number of parts E60 Number. It can happen that a given exemplar, or subset of exemplars, originally
produced, or intended to be produced, with that characteristic, accidentally lacks it. This fact should be recorded as a property of F5
Item, and not of F3 Manifestation Product Type.