{
  "schema": {
    "options": {
      "properties": {
        "options.username": {
          "type": "username",
          "title": "Username description frozen"
        }
      },
      "type": "object",
      "title": "Common configuration"
    }
  },
  "model": {
    "options.username": {
      "readOnly": true
    }
  },
  "form": {
    "options.username": {
      "pattern": "^[a-z_][a-z0-9_-]{0,30}[$a-z0-9_-]{0,1}$",
      "type": "input"
    },
    "null": [
      {
        "title": "Configurer",
        "type": "submit"
      }
    ]
  },
  "version": "1.0"
}