This is DDI-Codebook version 2.6 submitted for review 2022-07-01.

THIS IS A REVISION of 2.5.1 and is backward compatible with 2.5 (a valid instance of DDI-Codebook 2.5 will 
validate against version 2.6).

The current publication includes the schemas, field-level documentation publication in 
HTML, and change documentation. Additional documentation on the use of DDI-Codebook 2.6 are published
as separate documents on the DDIAlliance.org product page for DDI-Codebook.

The continued development of DDI-Codebook reflects the work of the
committees and individuals who developed DDI versions 1.0 - 2.5 as well as the collective
ideas, needs, and work of the Expert Committee of the DDI Alliance. 

We would like to thank the following member organizations which have
supported the DDI Alliance in their development of DDI version 2.6:

    University of Alberta, Canada
    Australian Bureau of Statistics (ABS)
    Australian Data Archive (ADA)
    University of California, Berkeley -- Computer-Assisted Survey Methods Program and UCDATA, USA
    Centre for Longitudinal Studies, Institute of Education University of London (Associate Member)
    Centro De Investigaciones Sociologicas (CIS), Spain
    Cornell University (CISER)
    Danish Data Archive
    Data Archiving and Networked Services (DANS), The Netherlands
    DataVerse
    Finnish Social Science Data Archive
    German Socio-Economic Panel Study (SOEP)
    GESIS - Leibniz Institute for the Social Sciences
    University of Guelph, Canada
    Institute for Qualitative Social Science (IQSS) at Harvard University
    Institute for the Study of Labor (IZA), Germany
    Institute for Social and Economic Research (ISER)
    International Association of Social Science Information Service and Technology (IASSIST)
    International Federation of Data Organizations (IFDO)
    Inter-university Consortium for Political and Social Research (ICPSR), USA
    Massachusetts Institute of Technology (MIT), USA
    Metadata Technologies, NA
    Minnesota Population Center (MPC), USA
    Norwegian Social Science Data Service (NSD)
    Open Data Foundation, USA
    Princeton University, USA
    Research Data Centre of the German Federal Employment Agency, Institute for Employment 
      Research (IAB)
    Roper Center, USA
    Stanford University, USA
    Statistics New Zealand
    Survey Research Operations, University of Michigan
    Swedish Social Science Data Service (SSD)
    Swiss Data Archive for the Social Sciences (SIDOS)
    University of Toronto Scholars Portal
    United Kingdom Data Archive
    University of Washington, Center for Studies in Demography & Ecology (CSDE), USA
    United States Bureau of Labor Statistics (Associate Member)
    World Bank, Development Data Group (DECDG)


DDI 2.6 XML Schema is released under the terms of the Creative Commons BY 4.0 (International).
Details see the file license.txt.