Dear Pooya:
a) How can I add the minimum and maximum numbers on the lines between two classes, like (0,1) or * (see http://upload.wikimedia.org/wikipedia/commons/0/03/Klassendiagramm-1.png)
Use the Aggregation line. There are multiplicity fields for each side in the Context menu of that element.
b) Is there a special double line available in the UML-Sheet, which presents the "must exist" relation between two classes?
I am not aware of such a shape.
c) Did I get it right, that the field "type" of "operationdata" of the classes context menu represents the output data of a method, while "parameterdata" is used for input arguments ?
Yes, with an additional distinction: The "type" field is used for the return type of the function (return X). However you can define output parameters, too (call by reference) by selecting the appropriate direction for a parameter. Regards, Thimo Langbehn
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