- Introduction to DDI 3.0
- DDI 3.0 Development History
- Understanding DDI 3.0
- DDI 3.0 Final Schema and Documentation
- Proof of Concept
- License and Credits
- DDI 2.1 to 3.0 Conversion
DDI 3.0, published in April 2008, represented a major advancement for DDI by fully incorporating XML Schemas and moving to a data life cycle approach. Element content for DDI 3.0 was developed by several Working Groups with the technical specification itself created by the Technical Implementation Committee (TIC).
The Bylaws of the Alliance mandate an open Public Review period during which the community may comment on a major release like Version 3.0. This review period occurred in Spring 2007, with Version 3.0 then issued as a Candidate Release, following approval by the DDI Alliance in May 2007 at its annual meeting.
On April 8, 2008, the Version 3.0 Candidate Release was made available in final form. After a short review period the DDI Alliance voted to publish the specification officially. The final published package was made available on April 28, 2008.
- Field-Level Documentation Generated from the XML Schemas
- Schema Descriptions (PDF 55K) -- Textual descriptions of the schemas
- Supplementary documentation
- Technical Specification, DDI 3.0 (2008-04-28), full download package including:
- Part I - Overview
- Part II - User Guide
- Part III - Model (not included in this version)
- Part IV XML Schema files and field-level documentation
- Prior releases of DDI 3 Schemas
The XML Schema files of DDI 3.0 are also available for online usage.
The DDI Alliance Bylaws require a demonstration of Proof of Concept before official publication of any change to the DDI specification. We provide this information in the form of a Proof of Concept table, distinguishing between use cases and implementations.
DDI 3.0 XML Schema is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
DDI 3.0 XML Schema is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. See also the GNU General Public License Web site.
Other DDI documents are distributed under Creative Commons licenses.
The development of DDI 3.0 draws on earlier DDI versions and work of the committees and individuals who developed them as well as the collective ideas, needs, and work of the Expert Committee of the DDI Alliance. Major contributions to DDI 3.0 were made by many individuals and organizations.
The following three files document the correspondence between DDI 2.1 and DDI 3.0. Please read both the Readme file and Translation Instructions prior to working with the spreadsheet.
This example shows a correspondence mapping prepared for the purpose of translating ICPSR materials to DDI 3.0.