[
  {
    "url": "/hello",
    "data": {
      "sitemap": {
        "changefreq": "weekly",
        "priority": 0.8
      }
    }
  },
  {
    "url": "/world",
    "data": {
      "sitemap": {
        "changefreq": "monthly",
        "priority": 0.4
      }
    }
  },
  {
    "url": "/extra"
  }
]