Den 2019-03-11 kl. 14.09 skrev Massimo Pizzol:
Good point. No need for separate subclasses, as also Agneta
pointed out. It is just an input relation or an output relation of
a flow-object in a specific activity context.
Environmental exchanges are also just flows (or flow-objects). CO2 can both be an emission to the environment and a (by-)product, but as a chemical it is the same. For this reason, it may be reasonable to distinguish between "carbon dioxide (product)" and "carbon dioxide (emission)". Whether that is best done by creating "product" and "emission" as sub-classes of flow-objects or just as properties, I am not completely sure. The general idea is not to be too specific if it can be avoided which would be an argument for the latter (property) option, but on the other hand the sub-calss option makes in clear that the "carbon dioxide" is placed in one or the other class. Any views on this?