See also the slideset on the [sharepoint](https://etsihq.sharepoint.com/:p:/r/teams/STF641/Shared%20Documents/General/01_TASK_AREA/T1%20(T2.1)%20-%20SAREF%20ontology%20patterns%20identification/Report%20on%20the%20use%20of%20SAREF%20core%20classes%20in%20extensions/Task%202%20how%20are%20classes%20used/PropertyAndUnitsUsage.pptx?d=w916b65101c5b406dbbe2fa029683e693&csf=1&web=1&e=WRg3DK) We'll take as running example [s4ener:Energy](https://saref.etsi.org/saref4ener/v1.1.2/#s4ener:Energy). In this issue we discuss the proper way to model the Max/Min additions, which in this case are added as subclasses (see [core discussion](https://labs.etsi.org/rep/saref/saref-portal/-/issues/8))