Can you help me writing a simple function that iterates on all subgraphs in the .dot file and print out the 1. subgraph name 2. for each edge source label / edge label / target label ? I've tryed with this but didn't work: [...] boost::GraphvizDigraph g; boost::read_graphviz(efsmfile, g); [...] boost::GraphvizDigraph::children_iterator subgraph_index, subgraph_end; for (boost::tie(subgraph_index, subgraph_end) = g.children(); subgraph_index != subgraph_end; subgraph_index++) { cout << get_graph_name(*subgraph_index) << endl; } const string& EFSM::get_graph_name(const Graph& g) { const typename boost::graph_property<Graph, boost::graph_name_t>::type& name = boost::get_property(g, boost::graph_name); return name; }