{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "definitions": {
    "recursive1": {
      "required": [ "node" ],
      "type": "object",
      "properties": {
        "node": {
          "$ref": "#/definitions/recursive2"
        }
      }
    },
    "recursive2": {
      "required": [ "node" ],
      "type": "object",
      "properties": {
        "node": {
          "$ref": "#/definitions/recursive1"
        }
      }
    }
  },
  "allOf": [
    {
      "$ref": "#/definitions/recursive1"
    }
  ]
}