<https://coderlessons.com/articles/java/antlr-i-jetbrains-mps-analiz-failov-i-otobrazhenie-ast-s-ispolzovaniem-oboznacheniia-dereva#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://coderlessons.com/articles/java/antlr-i-jetbrains-mps-analiz-failov-i-otobrazhenie-ast-s-ispolzovaniem-oboznacheniia-dereva>