This documentation describes which properties are required, encouraged, or optional for structured data with Specific intending to Google Search. Most Look for structured facts takes advantage of schema.org vocabulary, but you ought to count on the Google Research Central documentation as definitive for Google Search behavior, rather than the schema. https://allyourbookmarks.com/story18653652/about-seo-automatique-google-rich-snippets-json-ld-open-graph