<https://itandlife.ru/programming/design-and-development-software/obshhie-principy-razrabotki-programmnogo-obespecheniya/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/WebPage>
<https://itandlife.ru/programming/design-and-development-software/obshhie-principy-razrabotki-programmnogo-obespecheniya/>