DDI Lifecycle Development History
DDI Lifecycle 3.2 was published on March 12, 2014. This version of the DDI Lifecycle specification builds on DDI Lifecycle 3.1, correcting documented bugs and refining some aspects of the specification. A change document in the download package identifies all changes, including which changes were backward compatible and the steps to take to move DDI 3.1 instances to DDI 3.2.
DDI Lifecycle 3.1 was published on October 18, 2009. DDI 3.1 reflects (1) the correction of bugs identified by implementers using DDI 3.0, and (2) the resolution of the final URN structure to ensure persistent URNs for all identified elements. Note that DDI 3.1 is not backward compatible with DDI 3.0. A change file in the download package identifies all changes, including which changes were backward compatible and the steps to take to move DDI 3.0 instances to DDI 3.1.
DDI 3.0 was published on April 28, 2008, and 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).