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{
  "description": "A classic literary work.",
  "properties": {
    "authorId": {
      "description": "Reference to the author",
      "type": [
        "string",
        "null"
      ],
      "x-ref-type": "Author"
    },
    "coverUrl": {
      "description": "URL to cover image",
      "type": [
        "string",
        "null"
      ]
    },
    "editionCount": {
      "description": "Number of editions in Open Library",
      "type": "number"
    },
    "firstPublishYear": {
      "description": "Year first published",
      "type": [
        "number",
        "null"
      ]
    },
    "openLibraryUrl": {
      "description": "URL to the work on Open Library",
      "type": "string"
    },
    "title": {
      "description": "Book title",
      "type": "string"
    }
  },
  "required": [
    "title",
    "editionCount",
    "openLibraryUrl"
  ],
  "title": "Book",
  "type": "object"
}