Currently there is no support for abstract and interface keywords.
Instances are never created from an abstract class. An abstract class is intentionally incomplete, thus forming the basis for other subclasses that can have instances.
An abstract class is represented like a regular class, but the name of the class is set in italics. Optionally, we can add the property string {abstract} below the class name.
Currently there is no support for
abstractandinterfacekeywords.Originally posted by @w00lf in https://github.com/lutaml/lutaml-uml/issues/28#issuecomment-764613383