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RDF/XML is a syntax,[1] defined by the W3C, to express (i.e., serialize) an RDF graph as an XML document. RDF/XML is sometimes misidentified as simply RDF because it was introduced alongside the other W3C specifications defining RDF and was historically the first W3C official RDF serialization format.

RDF/XML is the primary exchange syntax for OWL 2, and must be supported by all OWL 2 tools.[2]

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