<https://secure.gravatar.com/avatar/95e97ed89ba7706be73a11524e0fdb66?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://appcolumbus.com/knowledgebase/geschaeftskosten-mit-saas-reduzieren/>