File menu

• New : remove all class definitions
• Open : open a UL file containing UL⁺⁺ language. Ask before opening if the user wants to remove the class definitions, which is equivalent to do New before. It is possible by answering "No" to supperpose the class definitions in a file and your current work. Notice that the graphical information is stored in the corresponding file with the extension GUL. If the file is missing, then random locations are used.
• Save : save the current class definitions in an UL file. The classes are reordered in order to follow the specification of the language which forbids forward definitions.
• Show : open a visualization window to show the UL⁺⁺ representation of your system. You may save the content of this window to a file.
• Console : open a message window showing what classes have been loaded, and the problems encountered if any.
• Quit : quit the application, ask for confirmation before exiting.

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