{
  "$ref": "#/$defs/TreeNode",
  "$defs": {
    "TreeBranch": {
      "properties": {
        "metadata": {
          "type": "string"
        },
        "node": {
          "$ref": "#/$defs/TreeNode"
        }
      },
      "required": [
        "metadata",
        "node"
      ],
      "type": "object"
    },
    "TreeNode": {
      "properties": {
        "left": {
          "$ref": "#/$defs/TreeBranch"
        },
        "right": {
          "$ref": "#/$defs/TreeBranch"
        },
        "value": {
          "type": "number"
        }
      },
      "required": [
        "value"
      ],
      "type": "object"
    }
  }
}