<https://aoi-cygnus.com/blog/2020/02/01/%e3%82%b7%e3%83%bc%e3%83%88%e3%82%a4%e3%83%b3%e3%83%8a%e3%83%bc%e3%82%b1%e3%83%bc%e3%82%b9/attachment/20180720174148/#listItem>
<http://schema.org/position>
"2"^^<http://www.w3.org/2001/XMLSchema#integer>
<https://aoi-cygnus.com/blog/2020/02/01/%E3%82%B7%E3%83%BC%E3%83%88%E3%82%A4%E3%83%B3%E3%83%8A%E3%83%BC%E3%82%B1%E3%83%BC%E3%82%B9/attachment/20180720174148/>