<https://www.chatbotsummit.com/post/swelly-keeps-on-growing-5-million-new-users-and-counting>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.chatbotsummit.com/post/swelly-keeps-on-growing-5-million-new-users-and-counting>