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In January 2019, the EU Open Data Portal implemented (the DCAT application profile for data portals in Europe), a specification based on W3C’s Data Catalogue Vocabulary () for describing public sector datasets in Europe.
As part of DCAT-AP, a list of themes has been developed to categorise the datasets and facilitate interoperability between EU and national data portals.
In addition to the 'Themes' data-classification category, a new data-classification category of 'Groups' has also been added. The 'Groups' data-classification category offers an alternative way to navigate and discover datasets, based on user requests and suggestions. While the list of options under the ‘Themes’ category is predefined, the list of options under ‘Groups’ will grow, adapting to user needs.