RDFa
RDFa (Resource Description Framework in Attributes) is a way of adding structured data to a web page through extra attributes on the HTML tags around the words people already see. The W3C's primer describes it as a set of attributes that add hints software can read to what's shown on screen.
Source: W3C, RDFa 1.1 Primer (Third Edition), checked October 29, 2026
What RDFa means for your business
Google's structured data guide lists RDFa as a supported format. For anything new, we'd still write JSON-LD, the format that guide recommends.
Your site may already carry some RDFa you never chose. The Open Graph protocol, which Facebook uses, says on its own site that it's based on RDFa. It works through tags in the head of the page, like og:title, og:image and og:url.
So we'd read what those tags say. og:title and og:image are the name and picture your page hands to Facebook, and they're easy to miss, since they don't show on the page itself.
If your share tags, your schema and your About page give different names or logos for your business, getting every version of your details to match is part of our entity work.
Last reviewed October 29, 2026. All terms
How AI answers it today
On October 29, 2026, Google's AI Overview cited the W3C primer, Wikipedia, rdfa.info and a Creative Commons wiki, and its definition matched the W3C's. ChatGPT cited nothing and compared RDFa with Microdata and JSON-LD, calling JSON-LD the one Google generally prefers.
Our run through ChatGPT and Google's AI Overview, October 29, 2026. A sample, not what every buyer sees.
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