<https://www.ipu-starting.kr/case-studies/markets/%ec%98%a4%ec%9d%bc-%eb%b0%8f-%ea%b0%80%ec%8a%a4/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.ipu-starting.kr/case-studies/markets/%EC%98%A4%EC%9D%BC-%EB%B0%8F-%EA%B0%80%EC%8A%A4/>