The Finnish Social Science Data Archive provides study descriptions for harvesting through their OAI-PMH Server Kuha. Supported formats are OAI Dublin Core (descriptions in Finnish, Swedish, English) and EAD (in Finnish). Kuha server generates these formats from FSD’s DDI metadata. They include metadata on study level but not on variable level, and are made available under a CC0 license. If you incorporate the records into a web service we wish that you link back to the FSD website, and inform us at fsd [at] uta.fi if using the records for a web service, research purposes or theses. Kuha software is available as open source (BSD-license).
More information: http://www.fsd.uta.fi/en/data/background/ddi-records.html
Kuha OAI-PMH server: http://services.fsd.uta.fi/oai
OAI-PMH protocol description: http://www.openarchives.org/OAI/openarchivesprotocol.html
Kuha OAI-PMH Server in GitHub: https://github.com/Tietoarkisto/kuha