[OWL Union of Classes](https://www.w3.org/TR/owl2-syntax/#Union_of_Class_Expressions) are classes that represent the union of two classes. They are represented as an ID pointing to a list of classes. - Unions should have a special entity page. - In many cases, the union class is a blank identifier. In those cases, a special rendering should be used in class instance properties.
OWL Union of Classes are classes that represent the union of two classes. They are represented as an ID pointing to a list of classes.