GraphViz, grouping the same edges

Question

digraph G {
  a -> b [ label = \"foo\" ];
  a -> b [ label = \"bar\" ];
}

This will create two edges between the \'a\' and \'b\' nodes. Is th

Answer 1

The "strict" keyword may help you.

strict digraph G {
  a -> b [ label = "foo" ];
  a -> b [ label = "bar" ];
}

This will combine the edges. But I believe it will only apply the first label.