<https://laccord.info/archives/2577/40%e4%bb%a3-%e3%82%b9%e3%83%88%e3%83%bc%e3%83%ab-%e3%82%b3%e3%83%bc%e3%83%86%e3%82%99#itempage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://laccord.info/archives/2577/40%E4%BB%A3-%E3%82%B9%E3%83%88%E3%83%BC%E3%83%AB-%E3%82%B3%E3%83%BC%E3%83%86%E3%82%99>