What is the DDI?
The DDI is a specification for describing social science data in XML. Essentially, the DDI is a way of formatting the documentation for a social science data file, such that it is much more useful than a simple MS Word or text file. The tagged structure enables computer processing of the information. The DDI is currently a specification, not a standard. While the DDI has not yet become a formal ISO standard, that is an important goal of the initiative.