<https://tulip-e.com/blog/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tulip-e.com/blog/tag/%E9%AB%98%E5%86%86%E5%AF%BA%E3%80%81%E3%82%B0%E3%83%AB%E3%83%A1%E3%80%81%E3%83%A9%E3%83%B3%E3%83%81%E3%80%81%E8%82%89%E3%80%81%E3%83%8F%E3%83%B3%E3%83%90%E3%83%BC%E3%82%B0/>