Found 3 schemes.
A common base profile of DDI for use by the member archives of CESSDA.
An extension of SDMX used to exchange statistical data and metadata.
A set of common technical and statistical standards and guidelines to be used for the efficient exchange and sharing of statistical data and metadata.
Sponsoring institutions include BIS, ECB, EUROSTAT, IMF, OECD, UN, and the World Bank. Technical Specification 2.1 was amended in May 2012.