digraph SimpleContent {+
−
  mindist = 2.0+
−
  1 -> 3 [label="restriction"]+
−
  1 -> 2 [label="annotation"]+
−
  1 -> 3 [label="extension"]+
−
  2 -> 3 [label="restriction"]+
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  2 -> 3 [label="extension"]+
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  1 [shape=circle, style=filled, color=blue]+
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  2 [shape=circle, style=filled, color=red]+
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  3 [shape=doublecircle, style=filled, color=green]+
−
}+
−