{
  "definitions": {
    "fallback": {
      "description": "何らかの原因でボタンなどが表示できなかった場合の代わりのテキスト",
      "type": "string"
    },
    "color": {
      "description": "アタッチメントの左に付くボーダーカラー",
      "$ref": "../../pattern.json#/definitions/string/color"
    },
    "text": {
      "description": "アタッチメントのテキスト",
      "type": "string"
    },
    "pretext": {
      "description": "アッタチメントの上部のテキスト",
      "type": "string"
    },
    "author_name": {
      "description": "テキストの上部に小さいフォントサイズで標示されるテキスト",
      "type": "string"
    },
    "author_link": {
      "description": "`author_name`テキストのリンク",
      "$ref": "../../pattern.json#/definitions/string/url"
    },
    "author_icon": {
      "description": "`author_name`テキストの前に付くアイコン画像のリンク",
      "$ref": "../../pattern.json#/definitions/string/url"
    },
    "title": {
      "description": "タイトル",
      "type": "string"
    },
    "title_link": {
      "description": "タイトルのリンク",
      "$ref": "../../pattern.json#/definitions/string/url"
    },
    "fields": {
      "type": "array",
      "items": {
        "$ref": "./field.json#/definitions/field"
      }
    },
    "image_url": {
      "$ref": "../../pattern.json#/definitions/string/url"
    },
    "thumb_url": {
      "$ref": "../../pattern.json#/definitions/string/url"
    },
    "footer": {
      "type": "string"
    },
    "footer_icon": {
      "$ref": "../../pattern.json#/definitions/string/url"
    },
    "ts": {
      "type": "number"
    },
    "attachment_type": {
      "type": "string",
      "examples": ["default"]
    },
    "callback_id": {
      "type": "string"
		},
    "actions": {
      "type": "array",
      "items": {
        "$ref": "./action.json#/definitions/action"
      }
    },
    "attachment": {
      "type": "object",
      "properties": {
        "fallback": {
          "$ref": "#/definitions/fallback"
        },
        "color": {
          "$ref": "#/definitions/color"
        },
        "text": {
          "$ref": "#/definitions/text"
        },
        "pretext": {
          "$ref": "#/definitions/pretext"
        },
        "author_name": {
          "$ref": "#/definitions/author_name"
        },
        "author_link": {
          "$ref": "#/definitions/author_link"
        },
        "author_icon": {
          "$ref": "#/definitions/author_icon"
        },
        "title": {
          "$ref": "#/definitions/author_link"
        },
        "title_link": {
          "$ref": "#/definitions/author_icon"
        },
        "fields": {
          "$ref": "#/definitions/fields"
        },
        "image_url": {
          "$ref": "#/definitions/image_url"
        },
        "thumb_url": {
          "$ref": "#/definitions/thumb_url"
        },
        "footer": {
          "$ref": "#/definitions/footer"
        },
        "footer_icon": {
          "$ref": "#/definitions/footer_icon"
        },
        "ts": {
          "$ref": "#/definitions/ts"
        },
        "callback_id": {
          "$ref": "#/definitions/callback_id"
        },
        "actions": {
          "$ref": "#/definitions/actions"
        }
			},
			"required": ["text"],
      "dependencies": {
        "author_link": ["author_name"],
        "author_icon": ["author_name"],
        "title_link": ["title"],
        "footer_icon": ["footer"],
        "actions": ["callback_id"]
      }
    }
  }
}