<https://www.ash-greene.org/%e6%98%9f%e4%bb%b2%e3%81%93%e3%81%93%e3%81%bf/257/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.ash-greene.org/%E6%98%9F%E4%BB%B2%E3%81%93%E3%81%93%E3%81%BF/257/>