<https://coderlessons.com/tutorials/devops/uchitsia-kukolnyi/kukolnyi-okruzhaiushchaia-sreda#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://coderlessons.com/tutorials/devops/uchitsia-kukolnyi/kukolnyi-okruzhaiushchaia-sreda>