{
  "type": "object",
  "properties": {
    "prop1": {
      "type": "object",
      "properties": {
        "prop2": {
          "type": "string"
        },
        "prop3": {
          "type": "array",
          "minItems": 0,
          "items": {
            "enum": [ "rst", "uvw", "xyz" ]
          },
          "uniqueItems": true
        }
      },
      "additionalProperties": false,
      "required": []
    }
  },
  "additionalProperties": false,
  "required": ["prop1"]
}