<https://www.clickacademy.co.kr/single-post/2016/05/27/2016-\uAD6D\uBBFC\uB300-\uC2E4\uAE30\uB300\uD68C\uAE30\uCD08\uC870\uD615>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.clickacademy.co.kr/single-post/2016/05/27/2016-%EA%B5%AD%EB%AF%BC%EB%8C%80-%EC%8B%A4%EA%B8%B0%EB%8C%80%ED%9A%8C%EA%B8%B0%EC%B4%88%EC%A1%B0%ED%98%95>