not implemented parts of UML 1.3

ArgoUML uses Novosoft's NSUML-Library as a metamodel, to store the models in. This library is complete UML 1.3, since it is generated directly from the specification, and offers various features. However, ArgoUML doesn't use all these, and doesn't allow the user to design everything which is possible with UML 1.3. Here's an (incomplete) list of these things: