<https://kodemari-kofu.net/2011/02/05/%e6%96%b0%e7%87%83%e5%b2%b3%e3%81%ae%e5%99%b4%e7%81%ab/#articleImage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kodemari-kofu.net/2011/02/05/%E6%96%B0%E7%87%83%E5%B2%B3%E3%81%AE%E5%99%B4%E7%81%AB/>