<https://mamaterrace.net/newss/%e7%a7%8b%e7%a5%ad%e3%82%8a%e3%80%80in%e3%80%80%e3%81%be%e3%81%be%e4%bf%9d%e8%82%b2%e5%9c%92%e6%96%87%e3%81%ae%e9%87%8c/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://mamaterrace.net/newss/%E7%A7%8B%E7%A5%AD%E3%82%8A%E3%80%80in%E3%80%80%E3%81%BE%E3%81%BE%E4%BF%9D%E8%82%B2%E5%9C%92%E6%96%87%E3%81%AE%E9%87%8C/>