{
  "metadata": {
    "title": "Example listing publications"
  },

  "links": [
    {"rel": "self", "href": "grade1.json", "type": "application/opds+json"}
  ],

  "publications": [
    {
      "metadata": {
        "@type": "http://schema.org/Game",
        "title": "Lesson 001",
        "author": "Mullah Nasruddin",
        "identifier": "http://example.app/id/lesson001",
        "language": "en",
        "modified": "2015-09-29T17:00:00Z",
        "subject": [
          {
            "name": "Mathematics",
            "scheme": "https://www.bisg.org/#bisac",
            "code": "MAT000000"
          }
        ]
      },
      "links": [
        {"rel": "self", "href": "lesson001/lesson001.json", "type": "application/opds-publication+json"},
        {
          "rel": "http://opds-spec.org/acquisition/open-access",
          "href": "http://localhost/opds/case_valid/grade1/lesson001/lesson001.html",
          "type": "text/html"
        }
      ],
      "images": [
        {"href": "lesson001/cover.png", "type": "image/png"  }
      ]
    }
  ]
}