data/json_schema/complex_schema.json

{
  "type": "array",
  "items": [
    {
      "type": "object",
      "properties": {
        "id": {
          "type": "integer",
          "minimum": 1
        },
        "url": {
          "type": "string",
          "maxLength": 10,
          "optional": true
        },
        "index": {
          "type": "integer",
          "minimum": 0,
          "optional": true
        },
        "selected": {
          "type": "boolean",
          "optional": true
        }
      }
    },
    {
      "type": "number",
      "optional": true
    }
  ]
}