<https://futaba-gohan-jikan.net/2013/09/04/%ef%bc%99%e6%9c%88%e4%ba%88%e5%ae%9a/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://futaba-gohan-jikan.net/2013/09/04/%EF%BC%99%E6%9C%88%E4%BA%88%E5%AE%9A/>