ObjectArtist UML is a development tool to create UML diagrams, based on the UML 1.x model. A future version should based on the UML 2.0 model. The specification for UML 2.0 delay since years and adopted not yet. Espacilly the specification for diagram interchange with XMI is very rudimentary und unusable. So long as not specification adopted, the futher development of the tools are deferred.