This documentation describes which Houses are required, encouraged, or optional for structured facts with special meaning to Google Lookup. Most Look for structured information utilizes schema.org vocabulary, but you must depend upon the Google Look for Central documentation as definitive for Google Search actions, rather than the schema. Facts-vocabulary.org markup https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html