• A W3C Recommendation that adds a set of attribute-level extensions to HTML, XHTML, and various XML-based document types for embedding rich metadata within web documents. The Resource Description Framework (RDF) data–model mapping enables the use of RDFa for embedding RDF subject–predicate–object expressions within XHTML documents. RDFa also enables the extraction of RDF model triples by compliant user agents. ← Wikipedia ↑ w3.org/TR/rdfa-primer

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