<https://secure.gravatar.com/avatar/dc93d3b89a7e49c5e688e2c5f7257f48?s=96&d=mm&r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.goshico.cz/desky-plosnych-spoju-zna-lidstvo-jiz-nekolik-desitek-let/>