<https://secure.gravatar.com/avatar/9825882363c15e4eeb52f89500aff1c3?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://academy.bit2me.com/it/cos%27%C3%A8-il-cloud-mining-cloud-mining/>