{
  "type": "object",
  "required": ["conference"],
  "properties": {
    "conference" : {
      "type" : "object",
      "required" : [
        "short_title",
        "title",
        "description",
        "start_date",
        "end_date",
        "picture_url",
        "difficulty_levels",
        "event_types",
        "rooms",
        "tracks",
        "date_range",
        "revision"
      ],
      "properties" : {
        "short_title": {
          "type": "string"
        },
        "title": {
          "type": "string"
        },
        "description": {
          "type": "string"
        },
        "start_date": {
          "type": "string", "format": "date"
        },
        "end_date": {
          "type": "string", "format": "date"
        },
        "picture_url": {
          "anyOf": [
            { "type": "string" },
            { "type": "null" }
          ]
        },
        "difficulty_levels": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["id", "title", "description"],
            "properties": {
              "id": { "type": "integer" },
              "title": { "type": "string" },
              "description": { "type": "string" }
            }
          }
        },
        "event_types": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["id", "title", "description", "length"],
            "properties": {
              "id": { "type": "integer" },
              "title": { "type": "string" },
              "description": { "type": "string" },
              "length": { "type": "integer" }
            }
          }
        },
        "rooms": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["id", "size", "events"],
            "properties": {
              "id": { "type": "integer" },
              "size": { "type": "integer" },
              "events": { "type": "array" }
            }
          }
        },
        "tracks": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["id", "name", "description"],
            "properties": {
              "id": { "type": "integer" },
              "name": { "type": "string" },
              "description": { "type": "string" }
            }
          }
        },
        "date_range": {
          "type": "string"
        },
        "revision": {
          "type": "integer"
        }
      }
    }
  }
}