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I think this would be better handled by the use of "alias" nodes. I logged on to the forum to see if that feature had been mentioned and this seems the most similar suggestion. An alias node would simply be a separate graphical representation of the original node. There would need to be a bit of an additional wrapper in order to store the separate location and link information associated with each instantiation. When processing or analyzing the graph structure, a node and all of its aliases should be treated as if they are one in the same node.
Yes, this is an exellent idea.
This would require that each node is a class instance, in the case of nodes dupplication there copies of the graphic image but not the fonctional instance of the node.
It also means that each instance of a graph node inherits the functional data of common reference node.