<https://meetingbase.com/blog/tag/%e8%b3%aa%e5%95%8f%e3%81%ae%e4%bb%95%e6%96%b9/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://meetingbase.com/blog/tag/%E8%B3%AA%E5%95%8F%E3%81%AE%E4%BB%95%E6%96%B9/>