Association class attributes in Domain Model Class Diagram
问题 Hi, I have recently started to learn system analysis and design and am having some trouble understanding domain model class diagram (DMCD) association class. As per image, when drawing the DMCD, I'd like to understand if an association class is allowed to contain attributes of the classes it derives from. The Invoice needs to contain the attributes apptNo and svcName. Association class inquiry image: Do I include the attributes as shown in the image? Or do I assume that the Invoice would