op.append("digraph dep \{ rankdir=BT; node[shape=none,margin=0,width=0,height=0,fontsize=10]; edge[dir=none,color=gray]; ranksep=0.2; nodesep=0.1;\n")
for mmodule in poset do
op.append("\"{mmodule.name}\"[URL=\"{mmodule.url}\"];\n")
op.append("digraph dep \{ rankdir=BT; node[shape=none,margin=0,width=0,height=0,fontsize=10]; edge[dir=none,color=gray]; ranksep=0.2; nodesep=0.1;\n")
for mmodule in poset do
op.append("\"{mmodule.name}\"[URL=\"{mmodule.url}\"];\n")