Pset_ManufacturerTypeInformation.ModelReference and Pset_ConstructionOccurance.ModelNumber seem to be the same

[Moult]

Reading back to the draft AOH-BSEM spec, it seems as though the difference is that Pset_ManufacturerTypeInformation.ModelReference is the manufacturer's "model number / reference" whereas Pset_ConstructionOccurance.ModelNumber is the "occurrence's installed model number". This nuance seems to be lost in the spec.

[aothms]

I guess it's somewhat implicitly there in the name and definition of the psets. The question is whether containment in a pset provides enough context. Ideally I think the property and also the property name should be as unambiguous as possible.