{
  "schema": {
    "type": "object",
    "title": "Types",
    "properties": {
      "string":  {
        "type": "string",
        "minLength": 3
      },
      "integer":  {
        "type": "integer"
      },
      "number":  {
        "type": "number"
      },
      "boolean":  {
        "type": "boolean"
      }
    },
    "required": ["number"]
  },
  "form": [
    "*",
    {"type": "submit", "title": "OK"}
  ]
}