{
  "type": "array",
  "minItems": 1,
  "items": {
    "type": "object",
    "required": [
      "series",
      "element"
    ],
    "properties": {
      "series": {
        "$ref": "#/definitions/position"
      },
      "element": {
        "$ref": "#/definitions/position"
      }
    }
  },
  "definitions": {
    "position": {
      "type": "object",
      "required": [
        "number",
        "of"
      ],
      "properties": {
        "number": {
          "type": "integer",
          "minimum": 1
        },
        "of": {
          "type": "integer",
          "minimum": 1
        }
      }
    }
  }
}