Use case editor is a visual UML modelling tool useful to develop standard UML Use Case Diagrams.

The main features of this editor follow:

• It is UML2 compliant
• It supplies support to use case sub-navigation
• It takes advantages from all the MO2L architecture features
• The diagram and the underlying model can be continuously validated fulfilling the UML metamodel (even if a project property can be set in order to disable the validation marks), validation taking advantages from Eclipse UML2 Project support

Figure 1 shows the main GUI of the editor, that is a classic Eclipse GUI with a custom perspective, with the editor area with its palette (Figure 2), the Model View (Figure 3) and the other common views.