DDI-Codebook v2.1

Downloads

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

• Tree Structure
• Whole Library
• Tables DTD file (used by the main DTD)

DDI Lite (recommended elements)

The full DDI Codebook specification was designed as a superset of elements providing an extensive coverage of social science data documentation. Many DDI users expressed the need for a "lighter" version of the specification that would contain a selection of the most relevant and commonly used DDI tags. In response to these requests, a recommended set of DDI elements is provided as a good basic framework for marking up documentation. The DDI Lite version is not a separate specification, but rather a subset of the full DDI Codebook model, and it is based on the earlier DTD version, not XML schemas.

To develop DDI Lite, several other metadata standards were reviewed to select elements that appeared to be either common across standards or critical to best practice in the documentation of social science data.