<https://ken-plan.com/2018/11/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/ListItem>
<https://ken-plan.com/2018/11/15/youtube-premium-music-premium%E7%94%B3%E3%81%97%E8%BE%BC%E3%81%BF%E3%81%BE%E3%81%99%E3%81%8B%EF%BC%9F/>