The objective is to able to create graphs in which a node can be overlapping between two or more subgraphs. Something like in the (erroneous) image below (A->B and A->C are in different subgraphs):
Something similar has been asked in Graphviz: Node in two subgraph and also in Same node in two subgraphs, but there had been no solution. This is something essential in graphs, and there should be an easy way of achieving that.
