digraph Annotation {
  mindist = 2.0
  1 -> 2 [label="appinfo"]
  1 -> 2 [label="documentation"]
  2 -> 2 [label="appinfo"]
  2 -> 2 [label="documentation"]
  1 [shape=doublecircle, style=filled, color=blue]
  2 [shape=doublecircle, style=filled, color=green]
}