[
  {
    "id" : 0,
    "child_ids" : [
      1,
      2
    ],
    "attributes": {
      "label" : "Node-0"
    }
 },
 {
    "id" : 1,
    "child_ids" : [
      3,
      4
    ],
    "attributes": {
      "label" : "Node-1"
    }
 },
 {
    "id" : 2,
    "child_ids" : [
      5,
      6
    ],
    "attributes": {
      "label" : "Node-2"
    }
 },
 {
    "id" : 3,
    "child_ids" : [],
    "attributes": {
      "label" : "Node-3"
    }
 },
 {
    "id" : 4,
    "child_ids" : [],
    "attributes": {
      "label" : "Node-4"
    }
 },
 {
    "id" : 5,
    "child_ids" : [],
    "attributes": {
      "label" : "Node-5"
    }
 },
 {
    "id" : 6,
    "child_ids" : [],
    "attributes": {
      "label" : "Node-6"
    }
 }
]