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XML schema entry point:

https://ddialliance.org/Specification/DDI-Codebook/2.1/XMLSchema/Version2-1.xsd

XML Document Type Definition (DTD) File


Description

DDI Codebook was the first version of the DDI to be published (Version 1 was released in 2000). DDI 2.0 was released in 2003, with Version 2.1 following two years later. The canonical expression of DDI 1.* through 2.1 is a Document Type Definition (DTD), although XML Schema versions have been created. The DTD can be converted to a schema using XML software, but the DTD should be used as the authoritative source for instance creation and validation.

Applications

Documentation of a simple study. Basic descriptive content for variables, files, source material, and study level information. Supports discovery, preservation, and the informed use of data. Primarily designed for documenting single studies in an archive.

Documentation

 
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