NTR: has quantity

[wdduncan]

For new term requests, please provide the following information:

Preferred term label

has quantity

Textual definition

A definition has not been proposed yet.
This a data property in COB. See related issue on the COB tracker: OBOFoundry/COB#35

In general, I like the idea of adding some DPs to RO. However, we need to think about how to address the question of including a unit with the quantity (e.g., Should we include a unit?)