<https://secure.gravatar.com/avatar/96426c5a74016f7661b6a4db048c19d5?s=96&d=blank&r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://news.sap.com/germany/2010/11/sap-robonova-gewinnen-roboterwettbewerb/>