> ## Documentation Index
> Fetch the complete documentation index at: https://wiki.platelunchcollective.com/llms.txt
> Use this file to discover all available pages before exploring further.

# RDFa

> RDFa (Resource Description Framework in Attributes) is an HTML5 extension for embedding structured linked data within web page content — one of three Google-...

*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.

## Related Terms

<CardGroup cols={2}>
  <Card title="JSON-LD" href="/ai-search-glossary/json-ld" />

  <Card title="Microdata" href="/ai-search-glossary/microdata" />

  <Card title="Structured data" href="/ai-search-glossary/structured-data" />

  <Card title="Linked data" href="/ai-search-glossary/linked-data" />

  <Card title="Schema.org" href="/ai-search-glossary/schemaorg" />
</CardGroup>

## Relevant Plate Lunch Collective Services

[AI SEO](https://www.platelunchcollective.com/services/ai-seo)  [Entity SEO](https://www.platelunchcollective.com/services/entity-seo)