<https://ja.coursera.org/lecture/genetic-lab/1-jie-pou-jing-de-shi-yong-fang-fa-D442Y#lecture>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ja.coursera.org/lecture/genetic-lab/1-jie-pou-jing-de-shi-yong-fang-fa-D442Y>