UML: use case diagrams: actors and connection points


There are some problems when specifying generalization relationships
among use case diagram actors in dia. Such relationships are described
in The Unified Modeling Language User Guide by Grady Booch, James 
Rumbaugh, and Ivar Jacobson. The problem is that the label used
to describe the role of a stick figure is below the connection
points pertaining to that figure. Thus the hollow triangle of
the arrow representing the generalizing relationship overlaps
with the text which makes the text hard to read even when the
arrow is Sent to Back. It would be nice if the connection points
were  below the text. This is how they are used in the book.



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