This documentation describes which Houses are required, encouraged, or optional for structured information with special meaning to Google Research. Most Research structured knowledge makes use of schema.org vocabulary, but you need to rely upon the Google Lookup Central documentation as definitive for Google Look for behavior, rather than the schema. https://bookmarkerz.com/story18547195/how-much-you-need-to-expect-you-ll-pay-for-a-good-rich-snippets-wordpress