<https://cdnazure.axonactive.com/wp-content/uploads/2018/08/DSC03186-optimize.jpg>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.axonactive.com/ja/news-events/news/brief-recap-certified-scrummaster-course-csm-august-2018>