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In page Dublin Core:

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In 2012, the DCMI Metadata Terms was created using a RDF data model.[6] This expanded element set incorporates the original 15 elements and many of the qualifiers of the qualified Dublin Core as RDF properties.[citation needed] The full set of elements is found under the namespace http://purl.org/dc/terms/. There is a separate namespace for the original 15 elements as previously defined: http://purl.org/dc/elements/1.1/.[7]