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{
  "type": "object",
  "title": "Photograph",
  "required": [
    "title",
    "commonsUrl"
  ],
  "properties": {
    "url": {
      "type": "string"
    },
    "via": {
      "type": "string",
      "description": "Where the description and image were read from"
    },
    "lccn": {
      "type": "string",
      "description": "Library of Congress control number, parsed from the filename. The key an enrichment pass against loc.gov would join on."
    },
    "lcUrl": {
      "type": "string",
      "description": "The Library of Congress record for the same sheet"
    },
    "notes": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "title": {
      "type": "string",
      "description": "Catalogued title. Square brackets in the original indicate a title supplied by the cataloguer."
    },
    "holder": {
      "type": "string",
      "description": "The institution that holds the original"
    },
    "images": {
      "type": "object",
      "properties": {
        "full": {
          "type": "string"
        },
        "thumb": {
          "type": "string"
        },
        "medium": {
          "type": "string"
        }
      }
    },
    "medium": {
      "type": "string"
    },
    "pixels": {
      "type": "object",
      "properties": {
        "width": {
          "type": "integer"
        },
        "height": {
          "type": "integer"
        }
      }
    },
    "rights": {
      "type": "string"
    },
    "created": {
      "type": "string"
    },
    "summary": {
      "type": "string"
    },
    "subjects": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Commons categories, filtered to topical ones"
    },
    "commonsUrl": {
      "type": "string"
    },
    "commonsFile": {
      "type": "string",
      "description": "Filename on Wikimedia Commons"
    },
    "contributors": {
      "type": "array",
      "items": {
        "type": "string"
      }
    }
  },
  "description": "One photograph from the albums shown alongside the charts. Most are unattributed."
}