<https://secure.gravatar.com/avatar/e2d5ae7094311cef229ea1c63a2bb896?s=96&d=mm&r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.krby-zatec.cz/poznavejte-nasi-planetu-spolu-s-nasi-pomoci-2/>