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It would be useful if a single diagram element can represent an implicit combination of multiple Ecore objects. See for example slides 10 and 11 of https://www.slideshare.net/Obeo_corp/siriuscon2016-integrating-textual-and-graphical-editing-in-the-poosl-ide , where the displayed Sirius Diagram element would ideally be coupled to the combination of an Instance and a Port Ecore object. Unfortunately, the Ecore model does not (always) explicitly contain an EObject for this combination. It would be inconvenient to create a derived Ecore attribute, only for this purpose.
*** This bug has been marked as a duplicate of bug 516150 ***