tools/json-graph/digraph2.json

{
  "graph": {
    "version": "1.0",
    "directed": true,
    "nodes": [
      { "id": "Node1",
        "edges": [ { "on": "Node1", "label": "Edge1" },
                   { "on": "Node2", "label": "Edge2" },
                   { "on": "Node3", "label": "Edge3" } ]
      },
      { "id": "Node2",
        "edges": [ { "on": "Node4", "label": "Edge4" } ]
      },
      { "id": "Node3",
        "edges": [ { "on": "Node4", "label": "Edge5" } ]
      },
      { "id": "Node4",
        "edges": [ { "on": "Node3", "label": "Edge6" },
                   { "on": "Node1", "label": "Edge7" } ]
      }
    ]
  }
}