Registration Open: DDI-CDI: Optimising Your Data Description for Integration and Reuse, Workshop 24 March 2023

Time: Friday 24 March 2023, 13:00-16:30 UTC

Location: online and Lindholmen Conference Centre 5 Lindholmspiren, 417 56 Lindholmen, Sweden (colocated side event to the RDA Plenary)

Register here:

Event Goal and Structure:

The goal of this workshop is to explain the mechanism employed by DDI-CDI and how it can most easily be leveraged to enhance the reusability of research data. DDI-CDI is a model-based, platform- and technology-independent specification designed to supplement the metadata holdings of data disseminators, archives, and producers. By allowing for an expression of structural metadata, with references to external controlled vocabularies and ontologies, and by connecting metadata records intended for discovery, provenance, and process description, it can act as a connector format which is independent of domain standards. Typically, it can be produced in a programmatic fashion from existing metadata records held in more domain-specific models, although it can also be used as a stand-alone specification. It supports granular, machine-actionable description of a wide variety of data, from traditional wide data files to event/streaming data to key-value (“big”) data and multidimensional cubes.

This workshop will present an overview followed by a series of worked examples, with an exploration of different types of implementations and features of the standard in each. The intent is to give more than an overview, to help participants understand not only what DDI-CDI is intended to do, but also how it works to complement other popular metadata models and standards. Different syntax representations of the standards will be discussed.

DDI has long published metadata standards for the social, economic and behavioural sciences, which are widely used among data producers and archives, including those in the CESSDA network, such as the Swedish National Data Service, the UK Data Archive, Sciences Po, Gesis, Sikt – the Norwegian Agency for Shared Services in Education and Research and many more. DDI-CDI represents an evolution reflecting the growing importance of cross-disciplinary research and the requirement for data services to describe new types of data coming from other domains. The result is a specification which can describe any data in a domain agnostic fashion and is useful within domains for which other DDI specifications are not relevant. Because of this domain independent feature, it has become central to the WorldFAIR project work on the Cross-Domain Interoperability Framework.

Each part comprises three topics, which will each be structured around a presentation and discussion.

Target Audience:

This workshop is intended to be useful to both technical and operational staff working in organisations which produce, archive, integrate, and disseminate quantitative research data, regardless of domain orientation. It is intended to address questions about what the practical implementation of systems supporting the FAIR principles will look like, and will appeal to infrastructure players who are concerned with broadening and deepening the reusability of their data holding through enhanced data and provenance description.

Part One: FAIR Functional Drivers and Requirements

13:00-13:30: The Variable Cascade: concepts, measures and observations.

13:30-14:00: Data Structures: the roles of concepts and variables.

14:00-14:30: Provenance: connecting data through process.

14:30-15:00 UTC: Break

Part Two: System Functions and Supporting Standards

15:00-15:30: Data integration across domains and structures.

15:30-16:00: Process description and alignment with PROV.

16:00-16:30: DDI-CDI as the connection point for a set of related specifications (CDIF example).

Organisational Note:

The workshop will be recorded and the recordings will be made available via CODATA Vimeo. If you plan to attend the event virtually, kindly note the Data Statement for CODATA Zoom at:

All attendees, onsite and online are expected to comply with the CODATA Code of Conduct:

EDDI Tutorial: 'Introduction to DDI', Paris, 28 Nov - recording and slides now available!

CODATA and the DDI Alliance collaborated to present free online training at the European DDI conference 2022. The training event introduced DDI and described the major specifications, DDI Codebook and DDI Lifecycle, as well as the upcoming DDI Cross-Domain Integration. In addition, DDI tool demonstrations showed how DDI can be used in practice.
You can catch up or revisit the workshop via the recording and slide decks now available at:
A wide range of speakers shared their expertise, as follows:
Introduction: Elizabeth Bishop (GESIS) & Wolfgang Zenk-Möltgen (GESIS);
DDI Codebook: Katja Moilanen (Finnish Social Science Data Archive);
DDI Lifecycle: Hayley Mills (CLOSER);
DDI Cross-Domain Integration: Arofan Gregory (CODATA);
plus DDI Tools demonstrations:
World Bank tools: Olivier Dupriez (World Bank);
Codebook Statconverter: Adrian Dușa (RODA);
Archivist: Becky Oldroyd (CLOSER);
DDI-CDI Tools implementation: Deirdre M. Lungley (UKDA);
Rich Data Services: Andrew DeCarlo (Metadata technology).
Check out their presentations, now available at:
Find out more about the CODATA / DDI Alliance training webinar series at:
Visit the DDI Alliance:

Save the Date: DDI Developers Hackathon in Gothenburg, March 24 & 25, 2023

Dear all

As some of you might have heard we are planning to revive the DDI Developers Group which has been dormant since 2014. To initiate this revival we plan to host a two days DDI Developers Hackathon from Friday 24th of March until Saturday 25th of March, 2023 at the Swedish National Data Service (SND) in Gothenburg. This event is directly following the Research Data Alliance (RDA) plenary in the same week. Therefore we believe some participants could already be at the location saving travel costs.

Therefore, if you are a developer, software engineer or programmer using or implementing tools around the DDI suite of metadata standards this event might be the chance to exchange ideas with similar people plus during the two days we would like to create some prototypical software implementations of current pain points or needed features for DDI tools.

The event is sponsored by the DDI Alliance, the Swedish National Data Service (SND) and the University of Applied Sciences of the Grisons which will provide catering and the location for the whole event. For a limited number of people also sponsorships for travel costs can be provided if the member organizations cannot sponsor it.

Please treat this mail as a Save-the-Date for this event and forward it to interested technical personnel in your organizations. We will soon follow up with another mail after EDDI containing a link for registration as well as an online document where proposals for topics can be entered.

Thanks in advance.

Best Regards

The DDI Developers Hackathon Organizing Team

Ingo Barkow

Johan Fihn Marberg

Olof Olsson

DDI Scientific Board Newsetter, Fall 2022

Ingo Barkow and Hilde Orten, Chair and Vice Chair of the DDI Scientific Board, distributed a newsletter about Scientific Board activities during the fall.  See:

Free, Virtual DDI Metadata Training: 28 November (13:00-15:30 CET)

The DDI Alliance and CODATA are hosting a free, virtual DDI metadata training workshop 13:00-15:30 CET on 28 November 2022. Anyone interested in metadata is welcome to attend!

Part of the European DDI User Conference, the training workshop will show how DDI metadata can describe single and longitudinal data collections, as well as preview the upcoming DDI-Cross Domain Integration (DDI-CDI) version that helps share and reuse data across domain boundaries and within and between research infrastructures.  Finally, DDI tools developers will demo tools and services for implementing DDI metadata.

To attend, please register by 22 November 2022 via the EDDI conference web site:

DDI Promotional Materials Available

Looking for DDI promotional materials?  Visit to find digital and physical items, including logos, handouts, brochures, and presentation templates.

Need physical materials -- like brochures, buttons, and stickers -- shipped to you?  Just let us know!

Call for Contributions: Implementation Languages Across the DDI Suite of Products

The DDI Technical Committee is asking for ideas and thoughts on the identification and use of implementation languages in the DDI suite of products.

The purpose of the this is to:

  • Identify priority implementation languages for DDI products (e.g. RDF, JSON, UML, XML, etc.)
  • Identify style options for implementation languages
  • Mappings to produce syntax representations
    • Moving from conceptual models to serialization
  • What aspects of implementation should be consistent
    • Document options, decisions, and reasoning
  • Provide guidance for variation from the agreed model
    • based on applied use of product
    • what needs to be noted and how (e.g. a consistent expression of exceptions and reasons)

There will be several ways to get involved, including:

  • Email ideas, proposals and thoughts to the DDI Technical Committee Chair, Wendy Thomas, at
  • Attend the consultation and requirements gathering meeting on 2 December in Paris (after the European DDI User Conference)

If you wish to attend the meeting on 2 December, registration is not mandatory, but it would be helpful to know, for numbers.

A workshop will be held on 5-6 December 2022 in Paris, France to produce a workplan and recommendations arising from the consultation.

Panel Session at DCMI Conference: The Cross-Domain Interoperability Framework: Coordinating Standards for Scalable, Practical FAIR Sharing

Oct 4, 2022 1:15 PM Eastern Daylight Time

To register:

We are now witnessing the emergence of FAIR data-sharing mechanisms in many areas, with the focus having shifted from the "what" to the "how" in many organizations. In many domains, there are a number of common standards – some which can apply equally across domains, and some specific to the data, processes, and practices within that domain. The challenge of FAIR data sharing – ubiquitous, automated reuse of data and metadata – is particularly acute across domain and infrastructure boundaries, demanding a change in how data are described.

To meet this challenge, it is important to first understand how the different standards and models used to describe data can be employed, so that they speak not only to traditional users, but also to users coming from other domains. One major development in this area is the idea of a FAIR Digital Object Framework (FDOF), where information - both data and metadata - of interest for the discovery and reuse of data can be identified and obtained. The FDOF represents an initial step, but does not address many of the practical issues of interoperability. We must look at the intersection of standards of different types and how they fit into this picture: the idea that every FAIR resource is implemented according to an entirely new set of technical standards is not realistic. The FDOF serves as an agreed way to obtain needed FAIR resources and to learn enough about them to understand some related resources (e.g., metadata schemas) at the level of a protocol. It is not sufficient on its own to produce interoperability, which will require an ability to actually understand the metadata schemas being used. When it comes to standards, some parts of FAIR are better supported than others.

Discovery of FAIR resources increasingly relies on standards and approaches which are widely adopted, and often much the same across domains and institutional boundaries. DCAT,, and Dublin-Core-based cataloguing metadata is commonly found in many areas. For other aspects of FAIR however, this degree of domain-agnostic standardization does not exist. Semantics and vocabularies are often deeply domain-dependent, and other important types of metadata needed for effective reuse - structural metadata, provenance, etc. - are also seen in many different forms, reflecting domain practice. Within any given domain, the standards requiring support may be well-understood, and limited in number. The same cannot typically be said when data from other domains is the target of reuse. If we are to make use of the FDOF as intended, we need to have a second tier of domain-agnostic standards which makes this profusion of models, schemas, etc. tractable. Such a second tier should be developed as a mechanism for domain-specific standards to be more easily exchanged and transformed. Technical standards such as RDF, JSON, XML (etc.) may provide a useful foundation, but they are not themselves sufficient.

The standard vocabularies and models which are understandable across domains provide an additional needed layer of interoperability. One good example of this is SKOS: many domains use concept systems of different types. If they are described in SKOS, they can at least be exchanged and processed in a coherent way across domain boundaries, even if the specifics of the concepts themselves need further attention. The EOSC Interoperability Framework introduced this idea of a leveled hierarchy of standards, and it is a useful way to understand what a practical approach to interoperability looks like as we progress from the universal toward the domain- and community specific. This session presents the requirements which lead us to a middle tier of domain-agnostic standards in support of the FDOF, and proposes some candidates for consideration based on implementations and explorations to date. Some examples of such standards are provided, showing how they can work together to provide the complete information set needed to reuse data in a FAIR data-sharing scenario across domain and institutional boundaries.

The focus of the session is on the "interoperability" and "reuse" elements of FAIR, but the session will touch on all aspects of FAIR data sharing, and how it might practically be realized. In particular, we aim to present these ideas to the DCMI community, to get feedback and to understand how this approach may intersect with current activities and thinking in the DCMI community and with related initiatives.

Speakers: Arofan Gregory (DDI Alliance and CODATA), Flavio Rizzolo (Statistics Canada), Franck Cotton (INSEE), Simon Hodson (CODATA).

Register now: "DDI Controlled Vocabularies, the CESSDA Workbench, SKOS and XKOS" Webinar

Wednesday, 12 October, 14:00-15:30 UTC

Register here:

Controlled vocabularies are an important form of metadata, and are used for a broad range of purposes. This webinar looks at how controlled vocabularies and similar types of concept schemes are used in and supported by the DDI standards. An introduction is provided for their use as qualifiers for metadata fields, as codelists and classifications for representing variables and response domains, as terms for describing coverage and supporting search, and for their use in defining variables, units, and populations. The support provided by DDI standards – including the XKOS RDF vocabulary – is highlighted. Real-world examples are provided, to illustrate the purposes described.

Presenters: Franck Cotton (INSEE), Christophe Dzikowski (INSEE), Arofan Gregory (DDI Alliance and CODATA)

DDI Alliance is a Sponsor of the 2nd IASSIST Africa Regional Workshop

The DDI Alliance is happy to sponsor the 2nd IASSIST Africa Regional Workshop, which will be held October 4-7, 2022 at the at the University of Ibadan, Nigeria.  Jared Lyle, Executive Director of the DDI Alliance, will give a virtual presentation on Thursday, October 6th.  For more information about the 2nd IASSIST Africa Regional Workshop, please visit:

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