<https://blog.bls.yokohama/#website>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.bls.yokohama/archives/tag/bls%E3%83%98%E3%83%AB%E3%82%B9%E3%82%B1%E3%82%A2%E3%83%97%E3%83%AD%E3%83%90%E3%82%A4%E3%83%80%E3%83%BC>