Dear Developers, the lemon renaming discussion is finished. The results: 1) Digraph, Graph, BpGraph (opt. BpDigraph) 2) g.u(e), g.v(e) (undirected graphs) 3) BpGraph::Red, BpGraph::Blue 4) Arc, Edge The lemon 0.x versions will hold the current names, but the lemon 1.0 will be changed according to renamings above. Best, Balazs