DCAT-AP: How to use the MDR data themes vocabulary?

5 years ago

How to use the MDR data themes vocabulary?

Issue

National implementations of DCAT-AP may use national classifications for published datasets, partly because such national classifications pre-existed the definition of the MDR Themes Vocabulary, and partly because national services require slightly different themes.

Current situation

Current DCAT-AP implementations often refer to local themes lists. In many cases, these local themes are described at a more detailed level, leading to longer themes lists. When detailed national lists exist, it is rather easy to map these local lists to the MDR themes.

In some cases, free text values are allowed for describing themes.

Recommendation

In order to address the issue of different theme categorizations being used at different administrative and geographical levels, the use of the MDR Data Themes on all levels (local, regional. National, European) is encouraged as it creates coherence. If local or national schemes must be used, mappings to the MDR Data Themes should be made available publicly. The European Data Portal, which is creating mappings between the MDR Data Themes and local or national schemes, and the Publications Office, being the owner of the MDR Data Themes, should work together in co-ordinating mappings to the MDR Data Themes. The mappings that have already been created should be published on the MDR together with the Data Themes NAL. The latest version of all mappings should always be accessible via the MDR.

Rationale

The use of a common set of values for data themes, or alignment of different schemes via the creation and publication of mappings to the MDR Data Themes, increases interoperability as it helps datasets published on different catalogues to be classified following a unique and unified classification scheme. This is particularly relevant for cases such as the European Data Portal which aggregates metadata from different catalogues. Moreover, the use of common data themes improves the findability of the categorised datasets via different points of access. 

Example

The example is based on the Nobel Prize catalogue, which is available via http://www.nobelprize.org/datasets/dcat. Some modifications were made in order to clarify the guideline.

Direct use of MDR data themes (recommended)

<rdf:Description rdf:about="http://nobelprize.org/datasets/dcat#ds1">

<rdf:type rdf:resource="http://www.w3.org/ns/dcat#Dataset"/>

<dct:title xml:lang="en">Linked Nobel prizes</dct:title>

<dcat:theme rdf:resource="http://publications.europa.eu/resource/authority/data-theme/TECH"/>

  </rdf:Description>

 

Mappings between local and MDR data themes

Local Theme (Belgium)

MDR Theme

Agriculture and Fisheries

http://publications.europa.eu/resource/authority/data-theme/AGRI

Culture and Sports

http://publications.europa.eu/resource/authority/data-theme/EDUC

Economy and Finance

http://publications.europa.eu/resource/authority/data-theme/ECON

Education

http://publications.europa.eu/resource/authority/data-theme/EDUC

Energy

http://publications.europa.eu/resource/authority/data-theme/ENER

Environment

http://publications.europa.eu/resource/authority/data-theme/ENVI

Health

http://publications.europa.eu/resource/authority/data-theme/HEAL

International

http://publications.europa.eu/resource/authority/data-theme/INTR

Justice

http://publications.europa.eu/resource/authority/data-theme/JUST

Population

http://publications.europa.eu/resource/authority/data-theme/SOCI

Public Sector

http://publications.europa.eu/resource/authority/data-theme/GOVE

Regional

http://publications.europa.eu/resource/authority/data-theme/REGI

Science and Technology

http://publications.europa.eu/resource/authority/data-theme/TECH

Transport

http://publications.europa.eu/resource/authority/data-theme/TRAN