semantic_feasibility(self, G1_node, G2_node)
Any subclass which redefines semantic_feasibility() must maintain the self.tests if needed, to keep the match() method functional. Implementations should consider multigraphs.
Returns True if adding (G1_node, G2_node) is semantically feasible.
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All aboves nodes referred to, (or are referred from) current nodes; Edges from Self to other have been omitted (or all nodes would be connected to the central node "self" which is not useful). Nodes are colored by the library they belong to, and scaled with the number of references pointing them