Section 10.3 of the report provides specific recommendations for the DDI Alliance, including:
- We encourage the DDI Alliance to develop guidelines and practices for registries of vocabularies, variables, and value domains similar to the development occurring in the SDMX world. DDI registries should work to encourage reuse of survey instruments and coding schemes in ways that will make it easier to discover and harmonize data. Since the DDI community is very decentralized, we expect that DDI registries will be federated using the DDI Agency Registry to simplify the assignment of persistent identifiers.As an XML based standard since its inception, DDI has supported URNs but as new serializations emerge, support should be accelerated for RDF URIs that are natively resolvable to locations on the Web.
- IUSSP strongly recommends that data producers apply URIs when data is created. It is much more efficient for persistent identifiers to be assigned by data producers, and these identifiers will provide more accurate information than annotations applied by data repositories late in the data life cycle. Tools for assigning persistent identifiers throughout the data lifecycle are already available. Wherever possible, these URIs should point to existing FAIR vocabularies, such as ELSST and the future FAIR Vocabulary of Demography.
- The DDI Alliance should also take other steps to facilitate harmonization of data sets. The assignment of persistent identifiers described in DDI registries is a pre-condition for reducing the costs of data harmonization, but other steps, such as using tools like SKOS to map variables to concepts are needed. We strongly encourage the DDI Alliance to contribute to research and the development of tools for automating linking identifiers across registries discussed below.
Webinar: FAIR Vocabularies in Population Research, 12 June, 12:00-13:30 UTC
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