<https://secure.gravatar.com/avatar/fd3bad09dcc4d3c174867053b9fb08aa?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://itworld.uz/blog/nachalo-ychebnoi-chetverti-ili-kak-ia-stal-koordinatorom-distancionnogo-obycheniia/>