Membership Documents
  • Bylaws
  • Charter
  • Join the DDI Alliance
  • Membership Form (PDF)
 Alliance Structure
  • Member Institutions
  • Expert Committee
  • Steering Committee
  • Committee Meeting Minutes
 Publications
  • General Brochure
  • Newsletter
  • Reports
    • Annual Report 2006 (PDF)
    • Annual Report 2005 (PDF)
    • Annual Report 2004 (PDF)
    • Strategic Plan, 2007 and Beyond (PDF)

 Publications & Presentations
 Projects Using the DDI
 DDI Users' Listserv
 Getting Started with the DDI
 Frequently Asked Questions (FAQ)
 DDI Logo

 Document Type Definition (DTD)
 XML Schema (XSD)
 DDI Lite (Recommended Elements)
 Version Control for DTD
 Information on DTD Elements (DDI Tag Library)

 Mapping to Other Metadata Standards
  • Dublin Core
  • Recommended Fields (CESSDA) (PDF)
 Related Tools
  • Software/Tools
  • XML/XSLT

Technical Information

DDI 3.1 Final Schema and Documentation

Technical Specification, DDI 3.1 (2009-10-18), 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 3.1 are also available for online usage. See the DDI3 page for more information on Version 3.1.

Version 3.0

• 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. See the DDI3 page for more information on Version 3.0.

Version 2.1

• Document Type Definition (DTD)
• XML Schema (XSD)
• DDI Lite (Recommended Elements)
• Version Control for DTD
• Information on the DTD Elements (DDI Tag Library)

This page contains links to the codebook DTD, its structure, and other information on how it can be used.

Document Type Definition (DTD)

• http://www.icpsr.umich.edu/DDI/Version2-1.dtd

• DTD: download

XML Schema (XSD)

• http://www.icpsr.umich.edu/DDI/Version2-1.xsd

• XSD: download

DDI Lite (Recommended Elements)

• General Information

• Tree Structure

Version Control for DTD

• DDI DTD Version History

• CVS Log on SourceForge.net

Archival DTDs and Schema can be found in the SourceForge.net >CVS repository by following any of the "Download" links above.

Information on the DTD Elements

This information is provided as instruction and support for those using the DTD or exploring its use in their markup efforts. Users should note that the Tag Library is an evolving document, and additional remarks, definitions, and examples will be added periodically.

The DDI Committee encourages researchers to use and evaluate the Tag Library and to send comments on their experiences to ddi@icpsr.umich.edu.

• DDI Tag Library

  • Tree Structure

  • Whole Library