Documentation Index
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Technical implementation · Structured Data
Definition
RDFa (Resource Description Framework in Attributes) is an HTML5 extension for embedding structured linked data within web page content — one of three Google-supported structured data formats alongside JSON-LD and microdata. RDFa embeds semantic annotations directly in the HTML markup using attribute extensions.
Why It Matters for AI Search
RDFa is a legacy structured data format that remains supported but is less commonly recommended than JSON-LD for new implementations. Brands using RDFa for existing structured data markup should ensure it is correctly implemented and validated, but new structured data work should be implemented in JSON-LD per Google’s current recommendations. The entity signal value of correctly implemented RDFa is equivalent to JSON-LD.
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