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526dbd9e44
In IFC2X3 IfcZone is a subtype of IfcGroup but not subtype of IfcSystem (it become one after IFC4), therefore IfcZone wasn't presented anywhere in BBIM UI. It's a bit confusing though to include IfcZone in systems when it's not actually a IfcSystem but having it in IfcGroups would be confusing too.