COMMONS13 — The quantities and units ontology does not allow representation of unitless quantity values

There is a gap in the quantities and units ontology whereby we cannot represent counts of things, which do not necessarily have units, nor can we properly represent ratio values, which may involve scalar quantity values that do not have units. There is also a challenge in representing ratio values more generally, since there is no numeric value representing the ratio on the class.

The quantities and units ontology does not allow representation of unitless quantity values

We agree that this needs to be addressed. The RTF plans to work with the SysML v2 team to revise the quantities and units ontology to incorporate tensor and vector quantities, and review other related concepts in the course of doing so. SysML v2 has only recently become an adopted standard, however, and due to time constraints we need to defer this to Commons 1.4.