A widely used, international standard for describing data from the social, behavioral, and economic sciences. Two versions of the standard are currently maintained in parallel:
Both versions are XML-based and defined using XML Schemas. They were developed and are maintained by the DDI Alliance.
The Data Documentaion Initiative website's list of tools to implement the DDI standard.
Server-side software for building a data portal, with a particular focus on survey datasets. It uses DDI to provide access to the data at the level of concepts and variables. For an example of it in use, see the SOEPinfo data portal.
A suite of tools for managing data and metadata in SDMX.
A simple tool for managing and accessing statistical metadata, using the SDMX framework.
A list of software tools supporting the SDMX standard.
The Data Documentation Initiative website's list of projects adopting or encouraging DDI as a standard.
The statistical office of the European Union, which implementats SDMX in a number of projects.
A data archive providing leadership and training in data access, curation, and methods of analysis for the social science research community; all metadata conforms to the DDI standard.
Provides members of the scholarly community with access to files associated with scholarly studies for the purpose of replication, for all studies conducted by ISPS-affiliated researchers. ISPS metadata records conform to DDI requirements and include a minimal set of Dublin Core metadata elements.
The SDMX website's list of current and planned practical implimentations from national and international organisations.