A JavaScript notation embedded inside a tag from the and aspects of the HTML website page. The markup is just not interleaved with the user-visible text, which makes nested info products easier to express, like the Place of a PostalAddress of a MusicVenue of an Event. Research or browse Schema.org https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html