<https://bg.sdusshor-amur.com/1267-2-tips-that-work-to-unravel-a-chain-easily>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://bg.sdusshor-amur.com/1267-2-tips-that-work-to-unravel-a-chain-easily>