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The Dataset Exchange Working Group published Data Catalog Vocabulary (DCAT) - Version 3 as a W3C Proposed Recommendation. DCAT is an RDF vocabulary designed to facilitate interoperability between data catalogs published on the Web. This document defines the schema and provides examples for its use. 

DCAT enables a publisher to describe datasets and data services in a catalog using a standard model and vocabulary that facilitates the consumption and aggregation of metadata from multiple catalogs. This can increase the discoverability of datasets and data services.

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