<https://secure.gravatar.com/avatar/ee17db5323b8afadfb198f0a98a5091a?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://nizhny.ru/stroitelstvo/drovyanye-kotly-otopleniya/>