<https://fourward.co.kr/blog/tag/%eb%94%94%ec%a7%80%ed%84%b8-%eb%a7%88%ec%bc%80%ed%8c%85#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://fourward.co.kr/blog/tag/%EB%94%94%EC%A7%80%ED%84%B8-%EB%A7%88%EC%BC%80%ED%8C%85>