<https://blog.freelance-jp.org/20200316-7588/%E3%82%B3%E3%83%A1%E3%83%B3%E3%83%88-2020-03-30-155023/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.freelance-jp.org/20200316-7588/%E3%82%B3%E3%83%A1%E3%83%B3%E3%83%88-2020-03-30-155023/>