This documentation describes which Qualities are required, encouraged, or optional for structured facts with Exclusive meaning to Google Search. Most Research structured facts makes use of schema.org vocabulary, but you ought to trust in the Google Lookup Central documentation as definitive for Google Look for actions, instead of the schema. https://peakbookmarks.com/story18722060/about-seo-automatique-google-rich-snippets-json-ld-open-graph