<https://tsunowine.com/ikiiki/2012/03/10/%e3%80%8c%e6%97%a5%e6%9c%ac%e3%83%af%e3%82%a4%e3%83%b3%e3%83%95%e3%82%a7%e3%82%b9%e3%82%bf%e3%80%8d/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tsunowine.com/ikiiki/2012/03/10/%E3%80%8C%E6%97%A5%E6%9C%AC%E3%83%AF%E3%82%A4%E3%83%B3%E3%83%95%E3%82%A7%E3%82%B9%E3%82%BF%E3%80%8D/>