{
  "metadata": {
    "title": "My Sample Catalog"
  },
  "links": [
    {
      "href": "https://example.org/catalog.json",
      "type": "application/opds+json",
      "rel": "self"
    }
  ],
  "navigation": [
    {
      "title": "All Books",
      "href": "https://example.org/catalog/all.json",
      "type": "application/opds+json",
      "rel": "subsection"
    }
  ],
  "publications": [
    {
      "metadata": {
        "title": "A Sample Book",
        "identifier": "urn:isbn:1234567890"
      },
      "links": [
        {
          "href": "https://example.org/book.epub",
          "type": "application/epub+zip",
          "rel": "http://opds-spec.org/acquisition"
        }
      ]
    }
  ]
}
