{
  "metadata": {
    "title": "Example for groups"
  },

  "links": [
    {"rel": "self", "href": "http://example.com/grouped", "type": "application/opds+json"}
  ],

  "groups": [
    {
      "metadata": {"title": "Main Menu"},
      "navigation": [
        {"href": "/new", "title": "New Publications", "type": "application/opds+json", "rel": "http://opds-spec.org/sort/new"},
        {"href": "/popular", "title": "Popular Publications", "type": "application/opds+json", "rel": "http://opds-spec.org/sort/popular"}
      ]
    },
    {
      "metadata": {"title": "Formats"},
      "navigation": [
        {"href": "/ebooks", "title": "EBooks", "type": "application/opds+json", "rel": "subsection"},
        {"href": "/audiobooks", "title": "Audiobooks", "type": "application/opds+json", "rel": "subsection"}
      ]
    }
  ]
}