module V : sig ... endmodule E : sig ... endval graph_attributes : t -> NeatoAttributes.graph listval default_vertex_attributes : t -> NeatoAttributes.vertex listval vertex_name : V.t -> stringval vertex_attributes : V.t -> NeatoAttributes.vertex listval get_subgraph : V.t -> NeatoAttributes.subgraph optionval default_edge_attributes : t -> NeatoAttributes.edge listval edge_attributes : E.t -> NeatoAttributes.edge list