European Commission launches…

European Commission launches online service to promote semantic interoperability

Published on: 25/01/2013
Last update: 04/10/2017

On 25 January, the European Commission has launched a online service to make it easier for public administrations to find and re-use semantic assets. More than one thousand assets from fifteen organisations, including several Member States and standardization bodies, can be found via the European Commission Joinup Portal ( By increasing the visibility and promoting the re-use of existing semantic assets the European Commission fosters semantic interoperability among information systems developed in different Member States.

For citizens to travel or move across Europe and for businesses to expand within the single market, they need to interact with several public administrations of Member States. To enable this, information needs to flow seamless across borders and sectors. The Interoperability Solutions for European Public Administrations (ISA) Programme of the European Commission addresses this need by promoting the re-use of data exchange models, taxonomies, data definitions and reference data, such as country codes. We call these semantic assets. In short, the re-use of semantic assets is vital for information to flow freely between Public Administrations and, unlike before, these semantic assets can now be found through a single search on Joinup.

This new service aggregates descriptions of semantic assets received from 15 partner organisations. This aggregation is made possible by the use of a common metadata vocabulary, known as the Asset Description Metadata Schema (ADMS).This is a standardised metadata vocabulary schema that helps public administrations, standardisation bodies and other stakeholders to document their semantic assets in a uniformed and structured manner (their name, their status, version, where they can be found on the Web, etc). In other words, ADMS defines a common way to describe semantic assets.

ADMS was developed following a process and methodology for creating vocabularies based on best practices of the World Wide Web Consortium (W3C). ADMS is the result of one year of consensus building within a multidisciplinary working group of more than 60 people from 20 EU Member States, several EU institutions, the US and Australia. Furthermore, a public review of the resulting vocabulary was conducted in January 2012. The ADMS specification was published by the W3C’s Government Linked Data (GLD) Working Group as the First Public Working Draft for further consultation within the context of the W3C standardization process, potentially leading to the publication of these vocabularies as open Web standards available under W3C's Royalty-Free License.

More than 1300 semantic assets from 15 participating organizations are already available. In more detail:


6 partner organisations from Member States:

  • BE - Belgian Interoperability Catalogue: This catalogue contains assets from different sources in Belgium that are used for the exchange of information between public administrations.
  • DE – Xrepository: The XRepository is an internet-based library for the provision of specialised and multidisciplinary data models and schemas at a central location. The main objective is to achieve public sector savings and improve interoperability through the re-use of these models and schemas in public projects. In addition, the XRepository serves as a central repository for data as part of the German-Online Project "Standardization" and for development of XÖV core components (reusable technical components for electronic data interchange).
  • DK -é is a single repository that supports digitisation in Denmark. It brings together key resources, recommendations and guidelines on IT, communication and IT development. The main goal of the repository is to strengthen cooperation between public and private parties.
  • EE – RIHA: RIHA, short for Riigi Infosüsteemi Halduse Infosüsteem, is the Estonian management system of governmental/ state information. The objective of RIHA is to guarantee the transparency of administration of the state information system, planning for information management and supporting the interoperability of databases of the state, local governments and persons in private law performing public duties. The registration of public databases and information systems on RIHA is mandatory and enforced by law.
  • FI - catalogue is a national portal and publishing platform, which gathers together information for supporting interoperability and enterprise architecture work by Finnish Public Administration.
  • GR - Greek Interoperability Catalogue:This catalogue contains assets from the Greek e-Government Interoperability Framework (eGIF). eGIF places among the overall design of the Greek Public Administration for the provision of e-Government services to public bodies, businesses and citizens. It aims to support effectively e-Government at Central, Regional and Local level and contribute to achieving interoperability at the level of information systems, procedures and data.

2 partner organisations from EU Institutions:

  • EU Semantic Interoperability Catalogue: This catalogue contains assets that can be used for the development of e-government services and supporting an EU policy and/or activity.
  • EU Publications Office - Metadata Registry: This catalogue contains a number of Named Authority Lists (NAL's) which help standardise the codes and the associated labels used in the Publications Office and on inter-institutional level in the context of the data exchange between the institutions involved in the legal decision making process of the European Union.

3 partner organisations from standardisation bodies:

  • DCMI - Dublin Core Metadata Initiative: The Dublin Core Metadata Initiative provides core metadata vocabularies in support of interoperable solutions for discovering and managing resources. It contains up-to-date information on DCMI metadata terms, including the classic Dublin Core Metadata Element Set, the DCMI Type Vocabulary, and resource classes used as formal domains and ranges.
  • GS1 in Europe eDox: eDox is the GS1 in Europe solution repository that publishes a wide range of freely available GS1 assets in over 20 sectors.
  • W3C Standards and Technical Reports: It consists of all standards and drafts published by the World Wide Web Consortium (W3C).

4 partner organisations from the IT sector:

  • Internal Commission on Civil Status (CIEC/ICCS): The aim of the International Commission on Civil Status ("ICCS") is to facilitate international cooperation in civil-status matters and to further the exchange of information between civil registrars. The scope and vision of the ICCS-CIEC Data Exchange Platform and Infrastructure is to bridge the judicial information, collaboration and networking gap in cross-border civil-status matters across Europe, by promoting the creation of a genuine European area of justice and judicial cooperation (beyond geographical barriers) in civil-status matters based on mutual recognition and confidence. It contains assets in the field of civil-status matters and to facilitate the exchange of information between civil registrars.
  • Linked Open Vocabularies (LOV):The LOV Initiative offers an entry point to the growing ecosystem of linked open vocabularies (RDFS or OWL ontologies) used in the Linked Data Cloud. It contains vocabularies listed and described by metadata, classified by vocabulary spaces, interlinked using the dedicated vocabulary VOAF.
  • ListPoint:This catalogue contains code lists to build apps, maintain data standards or to build interoperability between multiple data sources.
  • Wolters Kluwer Vocabularies: This catalogue contains two thesauri. The thesauri provide standardized keywords with a thematic structuring of legal content and thus facilitate a search for similar terms and related topics. This may facilitate the incorporation of new subjects and significantly improve electronic legal databases.

Questions and Answers

What are semantic assets?

Semantic assets are highly reusable metadata (e.g. xml schema, generic data models) and reference data (e.g. code lists, taxonomies, dictionaries, vocabularies) that are used by public administrations, in their information systems, to share information.

Who benefits from the ADMS-based federation of semantic assets repositories?

The service addresses both users and publishers of semantic assets.

  • For users, it offers a single access point to a large number of semantic assets that exist in Europe, enabling them to easily discover what is available for re-use.
  • For publishers, it enables to describe standards for information exchange in a common way, using the Asset Description Metadata Schema (ADMS), and publish these descriptions on Joinup. This makes their standards better searchable and visible on the web through a single point of access.

Why a single point of access for semantic assets is important?

When two parties exchange information, they need to agree on technical, semantic, and organisational conventions. Such conventions are documented in interoperability standards and specifications. However, in spite of their importance, standards are not easily discoverable on the web because information about them is seldom available. Navigating on the websites of the different publishers of standards is not efficient either. Hence, still today, it is not easy for public administrations to discover what standards are available to them for re-use. Highly reusable data models, valuable code lists and other similar specifications are not easy to find on the web. As these assets are not easy to discover, public administrations spend resources recreating them over and over again. It is not only the money that is spent on reinventing the wheel but also the money needed to fund endless mapping and convergence projects between similar specifications. ADMS and the federation help solve this problem.

How to join the ADMS-enabled federation?

Practically, the ADMS-enabled federation service first supports publishers to describe their interoperability standards (in a common way) using URIs in RDF (Resource Description Framework), a standard by W3C. At this point, publishers have created description metadata of their interoperability standards. The service then helps publishers upload these description metadata (described in RDF) on the EU official interoperability platform, Joinup.

There are several alternatives that currently exist to join the federation. The 15 partner organisations have used one of these alternatives to federate their semantic assets on Joinup:

  1. Use Joinup to provide ADMS-conform descriptions of your assets.
  2. Use the ADMS spreadsheet. Publishers can learn how to Generate ADMS asset descriptions from a spreadsheet with Google Refine RDF and download the spreadsheet on Joinup. This alternative has been used by partner organisations such as and the Belgian Interoperability Catalogue.
  3. Use a SPARQL CONSTRUCT query on your triple store. This alternative has been used by partner organisations such as Linked Open Vocabularies (LOV)
  4. Develop an ADMS-conform exporter. This alternative has been used by partner organisations such as Xrepository.

Whatever the solution chosen to join the federation, the ISA programme has set up a dedicated team to support you joining the federation and publishing your semantic assets on Joinup. Please visit the Community of European Semantic Asset Repositories (CESAR) on Joinup.

Additional information

  1. The catalogue of federated semantic asset repositories on Joinup
  2. Promo video of the ADMS-enabled federation of repositories
  3. ADMS-enabled federation of semantic asset repositories - Brochure
  4. ADMS Brochure
  5. How to join the federation

For more information:


Tue, 29/01/2013 - 23:42

Is this ready to launch?

Of the “specifications” listed by the new service, I note that there are

- 896 from W3C (many of which are redundant, outdated or superseded by later versions)

and zero from each of




- The Open Group


- the three global (ISO, IEC, ITU) and three European (CEN, CENELEC, ETSI) de jure standardisation bodies,


It is promoted as a service to find specifications “that have been used to develop information systems”. Many of the entries listed clearly do not help develop information systems, and many more that clearly do are not listed at all. It is flagged as a “new service”, not as a prototype or a pre-production site, so many may be misled into believing the completeness of the results they find.

What should I read into this? How was the content populated? Manually? By the contractors? By the organisations listed? Or was it populated automatically?

If the repository has been engineered in a way that explicitly favours discovering and displaying results from one organisation, in what way is this different from, say, Google being accused of manipulating search result ranking, in favour of its own properties?

This is seriously worrying if ever this resource be used or cited by anyone trying to find a legitimate and complete response to specific questions about what specifications exist to address particular issues.

I would like some assurance that this announcement is incorrect and that what has been launched is only a prototype - which is something that I could understand and even wlecome as a first, pre-production site

Fri, 01/02/2013 - 08:47


Hello Peter,   I am pleased to hear from you. Thank you for taking some time to provide us with feedback on our announcement.  The federation is fundamentally different from Google because every participant must describe its ICT specifications in ADMS – there is no automated online harvesting for the moment. Once a participating organisation creates its ADMS file, in RDF or XML, we upload it on Joinup. The contributor chooses what to include in the file, we provide them with guidelines on how to make the selection. This means that the content comes from organisations that have voluntarily decided to use ADMS and make their ICT specifications searchable on Joinup. So far we have more than 1.300 assets from 17 organisations. We have received ADMS files from Member States, Standardisation Organisations and Private Organisations. You can have a more detailed look at Joinup:    The federation is a new service and, as such, improvements, at all levels, will come from more contributions from organisations like OASIS and its use by the online community. We keep collaborating with participating organisations so that they can enhance their ADMS descriptions according to the feedback received. For example, we will forward your remarks to W3C for them to become aware of your concerns. Please feel free to give us more detailed information about descriptions of standards that you consider to be outdated.    I would also like to add that several organisations mentioned by you are expected to join the federation in the next months.  We hope that your email precedes a decision by OASIS to join the federation. As you may know, we have tried to have OASIS onboard as from the start but, unfortunately,  in March 2012 Robin Cover told us that this was not possible as OASIS lacked a database of canonical metadata and  was not sure on how to handle the URIs for licenses (IPR). We are also pleased to inform that we (the contractor of ISA action 1.1) can provide limited support, please have a look at this page on Joinup for more information:    To conclude, we look forward to help OASIS adopt ADMS and join the federation with the least possible delay. 

Mon, 04/02/2013 - 22:29


I do not entirely understand your criticism that the federation of semantic asset repositories on Joinup cannot be an operational service because its lack of "completeness". As far as I can see, the service does not promise in any way that its content collection is complete. It does indeed rely on voluntary contributions by the 15 content providers listed above which is a subset of organisations that have useful resources. We would welcome more content providers coming on board, because that would mean that the service becomes more useful.

The approach to rely on voluntary contributions is the same as the approach of, the portal that lets you explore Europe's cultural collections. They have metadata for a very large collection of cultural material, but even they aren't "complete" -- they just have what their providers contribute. If you were really interested to see resources held by the British Museum or the Uffizi in Florence, two important cultural institutions that are not in the list at, you might then also argue that Europeana can't be an operational service because it does not include some material that is important to you.

In my mind, both Europeana and (on a smaller scale) the federation on Joinup intend to provide a service that is useful and that can grow over time. Both are quite explicit about what is in the collection, so every user will be able to look at the list of providers and decide whether they are going to find useful stuff. If their favourite content provider isn't listed, they will go somewhere else, or try to convince that content provider to join the federation.

My personal opinion is that completeness is a good long-term target but I'll settle for usefulness in the meantime.


Sat, 16/08/2014 - 15:16

A little error in Mister Makx Dekkers link ( he added some extra caracters that made the link inoperant.

Corrected link :


thank you

Patrice Krysztofiak

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