<https://www.nimbleams.com/blog/4-ways-to-turn-your-attendees-into-active-participants-using-a-mobile-event-app/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.nimbleams.com/blog/4-ways-to-turn-your-attendees-into-active-participants-using-a-mobile-event-app/>