The about and mentions markups are Houses of webpage schema which explicitly inform search engines like Google and Bing what topics a page is primarily about and what other topics are simply being mentioned or referred to. Полное руководство по работе со структурированными данными An HTML5 extension that supports connected https://bookmarkfly.com/story19435211/5-essential-elements-for-schema-all-in-one-schema-rich-snippets