<https://hidebus.com/keepcast-nagoya-2019-report2/%e3%82%ad%e3%83%bc%e3%83%97%e3%82%ad%e3%83%a3%e3%82%b9%e3%83%88%e6%88%a6%e5%88%a9%e5%93%81%e2%91%a1/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hidebus.com/keepcast-nagoya-2019-report2/%E3%82%AD%E3%83%BC%E3%83%97%E3%82%AD%E3%83%A3%E3%82%B9%E3%83%88%E6%88%A6%E5%88%A9%E5%93%81%E2%91%A1/>