<https://www.run-dreams.com/post/\u30103\u6642\u9593\u304B\u3051\u3066\u3011>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.run-dreams.com/post/%E3%80%903%E6%99%82%E9%96%93%E3%81%8B%E3%81%91%E3%81%A6%E3%80%91>