The following links lead to a module-by-module explanation of the schemas for DDI version 3.0.
- Archive module
- Comparative module
- Conceptual components module
- Data collection module
- Dataset module
- Dublin Core Elements module
- DDI profile module
- Grouping module
- Instance module
- Logical product module
- Physical data product module
- Physical data product - inline n-cube module
- Physical data product - normal n-cube module
- Physical data product - tabular n-cube module
- Physical data product - proprietary module (beta)
- Physical instance module
- Reusable module
- Study unit module
Note: There are also some non-DDI modules in this package, to facilitate the use of XHTML and XML Schema. These are documented separately by their maintainers.