<https://ryushiroyamaguchi.com/category/%e9%98%b2%e9%9f%b3/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/ListItem>
<https://ryushiroyamaguchi.com/category/%E9%98%B2%E9%9F%B3/>