ECDCAT-AP is the European Commission's standard specification for describing datasets published on open data portals across Europe. By constraining and extending the W3C's Data Catalogue Vocabulary (DCAT), it enables cross-border and cross-sector search for public sector data, powering interoperability among dozens of national and institutional data portals. Since its initial release in 2013, DCAT-AP has become the de facto metadata backbone of the European open data ecosystem.
Background
As European governments began publishing open data, each portal developed its own metadata conventions, making it difficult for citizens and researchers to discover datasets across borders. The European Commission, through its Interoperability Solutions for Public Administrations (ISA) programme, initiated a working group to create a shared metadata specification. Building on W3C's DCAT, the working group released DCAT-AP 1.0 in 2013 as an application profile that prescribes mandatory, recommended, and optional classes and properties for dataset descriptions, along with specific controlled vocabularies such as EuroVoc for themes and the EU Authority Tables for publishers and file types.
The specification has been maintained by the SEMIC (Semantic Interoperability Community) action, now part of the Interoperable Europe programme. Development is governed by a formal Change and Release Management Policy, with all changes discussed openly in the DCAT-AP Working Group.
Purpose and Scope
DCAT-AP serves three primary audiences. Data publishers use it to describe their datasets in a standardized way that is portable across platforms. Aggregators, most notably the official European Data Portal (data.europa.eu), harvest DCAT-AP metadata from national portals to present a unified search interface. Data consumers benefit from consistent descriptions that make datasets discoverable regardless of which member state hosts them.
The profile defines core classes including Catalogue, Dataset, Distribution, and Data Service, each with specified cardinality and vocabulary constraints. It supports multilingual descriptions, licensing information, temporal and spatial coverage, and provenance chains.
Key Classes and Properties
| Class | Role |
|---|---|
| Catalogue | A collection of metadata about datasets |
| Dataset | A conceptual entity representing a collection of data |
| Distribution | A specific representation of a dataset (file, API, etc.) |
| Data Service | An operation providing access to one or more datasets |
Mandatory dataset properties include title, description, and publisher. Recommended properties include theme (from the EU Data Theme vocabulary), keyword, contact point, and spatial/temporal coverage.
Extensions
DCAT-AP serves as the foundation for domain-specific extensions:
- GeoDCAT-AP extends the profile for geospatial datasets, aligning with INSPIRE metadata requirements.
- StatDCAT-AP provides additional properties for statistical datasets, bridging SDMX and open data portals.
- DCAT-AP for High-Value Datasets (HVD) was released in December 2023 to support compliance with the EU's High-Value Datasets Implementing Regulation.
- Domain-specific data spaces (mobility, health, language) are developing their own DCAT-AP extensions.
Governance and Maintenance
DCAT-AP is maintained by the SEMIC Support Centre under the European Commission's Directorate-General for Digital Services (DG DIGIT), in collaboration with DG CONNECT and the Publications Office of the EU. Changes follow a documented release management policy, with public review periods and working group consensus. The specification has progressed through versions 1.0 through 3.0.1, with the latest release in October 2025.
Notable Implementations
DCAT-AP is implemented by the European Data Portal (data.europa.eu), the EU Open Data Portal, and national data portals of Germany (GovData), Belgium, the Netherlands, Spain, Ireland, Switzerland, Sweden, Italy, Norway, and many others. The Interoperability Test Bed provides an online validator for checking metadata conformance against DCAT-AP SHACL shapes. CKAN, the widely-used open data portal software, includes built-in DCAT-AP harvesting support.
Related Standards
- DCAT (W3C) is the base vocabulary that DCAT-AP profiles and constrains.
- GeoDCAT-AP extends DCAT-AP for geospatial datasets.
- StatDCAT-AP extends DCAT-AP for statistical datasets.
- Dublin Core terms are reused within DCAT-AP for basic descriptive properties.