<https://craceed.com/blog/2018/01/#listItem>
<http://schema.org/position>
"3"^^<http://www.w3.org/2001/XMLSchema#integer>
<https://craceed.com/blog/2018/01/26/%E6%89%8B%E3%81%8C%E5%B1%8A%E3%81%8D%E9%9B%A3%E3%81%84/>