{

"chapters": [

    { "caption": "No content", "chapter_id": "no-content" },
    { "caption": "Short content", "chapter_id": "short-content",
      "sections": [
        { "caption": "Short content" }
      ]
    },
    { "caption": "Long content", "chapter_id": "long-content",
      "sections": [
        { "caption": "Long content" }
      ]
    }

]

}
