<https://news.readmoo.com/tag/%e6%95%a6%ef%bc%8e%e5%be%b7%e5%8b%92%e6%a0%b9/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://news.readmoo.com/tag/%E6%95%A6%EF%BC%8E%E5%BE%B7%E5%8B%92%E6%A0%B9/>