<https://www.scienceall.com/2%ed%95%99%eb%85%84-2%ed%95%99%ea%b8%b0-4%eb%8b%a8%ec%9b%90-%ec%88%98%ed%95%99%ec%9d%b5%ed%9e%98%ec%b1%85-61%ec%aa%bd-6%eb%b2%88/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.scienceall.com/2%ED%95%99%EB%85%84-2%ED%95%99%EA%B8%B0-4%EB%8B%A8%EC%9B%90-%EC%88%98%ED%95%99%EC%9D%B5%ED%9E%98%EC%B1%85-61%EC%AA%BD-6%EB%B2%88/>