Schema.org Vocabulary
Shared vocabulary for structured data markup. 800+ types, 1400+ properties understood by Google, Bing, Yahoo, Yandex.
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Where this one tends to earn its keep.
SEO rich snippets and structured data markup
E-commerce product data for search engines
Job posting, recipe, and event markup
Knowledge graph seed data from web pages
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Derived from schema.org, licensed under CC BY-SA 3.0. This derivative work is likewise licensed CC BY-SA 3.0. Source: https://schema.org/
Verified against the licence text on 2026-08-07.
Others worth a look in Web Standards.