"Spatial" isn't particularly meaningful when talking about classes, so it's not surprising that UML doesn't generally attempt to express that. We can probably

"Spatial" isn't particularly meaningful when talking about classes, so it's not surprising that UML doesn't generally attempt to express that. We can probably just agree to disagree here. I think class diagrams are often quite useful. They existed before UML and they are used even by people who don't use UML.