<https://highballman.com/tag/%e7%b4%94%e3%83%a9%e3%83%bc%e3%83%a1%e3%83%b3/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://highballman.com/tag/%E7%B4%94%E3%83%A9%E3%83%BC%E3%83%A1%E3%83%B3/>