Poseidon is a sophisticated UML drawing program. As shown in Figure 2, it is geared to UML creation. I was not able to create, for example, the crossover connector that I did in DIA. Nor could I ...

For now, I’ll focus on one aspect of UML: the elements of a class diagram. Arguably, class diagrams are the most often used UML diagrams. The purpose of a class diagram is to specify the ...