<https://www.iq.com/play/19rwgei1yo>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.iq.com/play/%E5%B0%84%E9%B5%B0%E8%8B%B1%E9%9B%84%E5%82%B3-2017-%E7%AC%AC13%E9%9B%86-19rwgde4j8?lang=zh_tw>