{
  "schema": {
    "type": "object",
    "properties": {
      "friendsA": { "$ref": "#/definitions/friends" },
      "friendsB": { "$ref": "#/definitions/friends" }
    },
    "definitions": {
      "friends": {
        "type": "array",
        "items": {
          "type": "object",
          "title": "Friend",
          "properties": {
            "nick": {
              "type": "string",
              "title": "Nickname"
            },
            "animals": {
              "type": "array",
              "items": {
                "type": "string",
                "title": "Animal name"
              },
              "default": [ "dog", "cat" ]
            }
          }
        }
      }
    }
  },
  "customFormItems": {
    "friendsB": {
      "type": "array",
      "key": "friendsB",
      "title": "Friends B",
      "readOnly": true,
      "items": {
        "type": "section",
        "items": [
          {
            "type": "array",
            "key": "friendsB[].animals",
            "items": [
              "friendsB[].animals[]"
            ]
          },
          "friendsB[].nick"
        ]
      }
    }
  },
  "value": {
    "friendsB": [ {
      "nick": "B",
      "animals": [ "fish", "bee" ]
    }, {
      "nick": "B2",
      "animals": [ "bee", "cat" ]
    } ]
  }
}