Explore reference architecture, license, data models, specifications and standards for developing European Digital services.
European license, frameworks, architecture and project management
Last update: 19/09/2025
European Interoperability Framework (EIF)
The European Interoperability Framework (EIF) is currently under revision, with a new version set to be adopted by the end of 2026 in line with the requirements of the Interoperable Europe Act.
CollaborationDigital-ready policymaking+3 topics
Last update: 24/01/2025
Interoperability Architecture Solutions
The EIRA collection proposes a interoperability reference architecture and tools to implement interoperable European digital services. It is based on ArchiMate for modelling.
Digital governmentICT+3 topics
Last update: 06/09/2024
PM² Methodologies
The PM² Methodologies are open and free methodologies provided by the European Commission. They include PM² Project Management, PM²-Agile, PM² Programme Management and PM² Portfolio Management
Open Source Software
Last update: 22/09/2025
EUPL - the free/open source software licence of the European Union
The European Public Licence (EUPL), EU's OSS licence, promotes interoperability and 'share alike' use. Compatible with GPL, it offers a clear, multilingual framework for public services and businesses. It is an EC solution.
LegalReusable Software Components+3 topics
European Commission Building Blocks (specifications)
Last update: 08/09/2025
eDelivery
Secure, interoperable data/document exchange across EU borders using AS4 Access Points, promoting vendor-neutral, reliable, and scalable communication for public administrations and businesses. It is an EC solution.
Reusable Software ComponentseDelivery and eInvoicing
Last update: 13/02/2024
eID
The eID Building Block enhances cross-border digital services in the EU by enabling secure electronic identification and transactions in compliance with the eIDAS Regulation, promoting interoperability, trust, and security. It is an EC solution.
Reusable Software ComponentseIdentity and eSignature
Last update: 13/02/2024
eInvoicing
The eInvoicing Building Block boosts EU eInvoicing, adhering to EU standards for economic benefits. It aids public/private sectors in digital transition, offering support services for smooth adoption of eInvoicing. It is an EC solution.
Reusable Software ComponentseDelivery and eInvoicing
Last update: 13/02/2024
eSignature
The DIGITAL eSignature Building Block enables electronic signatures in compliance with the eIDAS Regulation, supporting secure, cross-border digital interactions for public services, businesses, and citizens. It is an EC solution.
Reusable Software ComponentseIdentity and eSignature
Last update: 13/02/2024
Once-Only Technical System (OOTS)
The Once-Only Technical System (OOTS) streamlines data retrieval for cross-border procedures, enhancing trust, efficiency, and data exchange among EU public administrations and citizens. It is an EC solution.
Collaboration
Last update: 24/04/2024
EU Digital Identity Wallet
The European Digital Idenity Framework harmonizes authentication to digital services and enables sharing relevant identity data for citizens and businesses.
SemanticsOpen Source Software+2 topics
Last update: 13/02/2024
European Blockchain Services Infrastructure (EBSI)
A blockchain initiative by the EU, enhancing public services with security, transparency, and efficiency. It supports cross-border verifiable credentials, benefiting citizens, EU institutions, and national administrations. It is an EC solution.
Open Source SoftwareBlockchain
Data models
Last update: 06/10/2025
Asset Description Metadata Schema (ADMS)
ADMS is a vocabulary for describing interoperability assets, enhancing their discoverability for ICT developers by standardising metadata for easier exploration and access. It is an EC solution.
Standardisation
Last update: 14/10/2025
BRegDCAT-AP
BRegDCAT-AP is an annex to DCAT-AP. It describes additional usage of the DCAT-AP for Base Registries. This document includes only the additional information that is required for the catalogued resources which are within scope of the regulation.
SemanticsStandardisation
Last update: 18/06/2025
Core Assessment Vocabulary (CAV)
CAV represents and defines what an “Assessment” of “assets” is and how to perform the assessment based on “Criteria”. It is a domain-agnostic vocabulary, meaning that it can be used to assess any type of assets. It is an EC solution.
ToolsStandardisation
Last update: 14/05/2024
Core Business Vocabulary
The Core Business Vocabulary is a simplified, reusable and extensible data model that captures the fundamental characteristics of a legal entity, e.g. the legal name, the activity, address, etc.
SemanticsStandardisation
Last update: 14/05/2024
Core Criterion and Core Evidence Vocabulary
The Core Criterion and Core Evidence Vocabulary is a simplified, reusable, and extensible data model that captures the fundamental characteristics of criterion and evidence, and is designed to support the exchange of information between organizations
SemanticsStandardisation
Last update: 14/05/2024
Core Location Vocabulary
The Core Location Vocabulary is a simplified, reusable and extensible data model that captures the fundamental characteristics of a location, represented as an address, a geographic name, or a geometry.
SemanticsStandardisation
Last update: 14/05/2024
Core Person Vocabulary
The Core Person Vocabulary is a simplified, reusable and extensible data model that captures the fundamental characteristics of a person, e.g. their name, their gender, their date of birth, their address, etc.
SemanticsStandardisation
Last update: 14/05/2024
Core Public Event Vocabulary
The Core Public Event Vocabulary is a simplified, reusable and extensible data model that captures the fundamental characteristics of a public event, e.g. the title, the date, the location, the organiser etc.
SemanticsStandardisation
Last update: 27/05/2024
Core Public Organisation Vocabulary
The Core Public Organisation Vocabulary provides a common data model for describing public organisations in the European Union.
SemanticsStandardisation
Last update: 14/05/2024
Core Public Service Vocabulary
The Core Public Service Vocabulary is a simplified, reusable and extensible data model that captures the fundamental characteristics of a public service, e.g. the title, the date, the location, the service provider, etc.
SemanticsStandardisationDigital government
Last update: 14/10/2025
Core Public Service Vocabulary Application Profile
CPSV-AP is a reusable and common data set to describe European public services. The goal is to harmonise the description of public services and guarantee a good level of interoperability. It is an EC solution.
Standardisation
Last update: 18/06/2025
Core Standards and Specifications Vocabulary (CSSV)
CSSV is a vocabulary describing standards and specifications used in software development. It is used by ELIS, the EIRA Library of Interoperability Specifications. It is an EC solution.
ToolsICT
Last update: 07/08/2024
DCAT Application Profile for data portals in Europe
DCAT-AP is a specification for metadata records, enhancing semantic interoperability across European data portals. Based on W3C's DCAT, it supports standardised dataset descriptions, enabling efficient data exchange and reuse. It is an EC solution.
Standardisation
Last update: 06/10/2025
DCAT Application Profile for High-Value Datasets
DCAT-AP for High-Value Datasets (HVD) is an annex for the DCAT Application Profile that is based on the Data Catalogue Vocabulary (DCAT) developed by W3C.
Standardisation
Last update: 16/07/2025
Reporting Requirement Metadata Vocabulary (RRMV)
The Reporting Requirement Metadata Vocabulary (RRMV) is a legal ontology that can be used to model reporting requirements in legal provisions.
Digital-ready policymakingEuropean Policies+9 topics
Last update: 16/02/2024
ELI ontology
ELI ontology provides the properties describing each legislative act. It standardises legislation metadata for cross-border access and reuse. It is an EU solution.
Legal
Last update: 30/11/2023
eProcurement Ontology
Procurement data has been identified as data with a high-reuse potential. Given the increasing importance of data standards for eProcurement, a number of initiatives driven by the public sector, the industry and academia have been kick-started in recent years. Some have grown organically, while others are the result of standardisation work. The vocabularies and the semantics that they are introducing, the phases of public procurement that they are covering, and the technologies that they are using all differ. These differences hamper data interoperability and thus its reuse by them or by the…
SemanticseProcurement
Standards and technical specifications
Last update: 14/11/2024
ELIS
ELIS is a list of standards and specifications for interoperability. Each of the specifications is linked to an EIRA architectural building blocks. It is an EC solution for IT architects.
ToolsStandardisation
Last update: 14/11/2024
ELAP
ELAP is a library of interoperability architecture principles, including EIF principles. It counts 42 principles such as EU Legislation, Accessibility, Once Only and more. It is an EC solution.
ToolsStandardisation
