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The suite of DDI Alliance products has been formally recognized as an international standard through the publication of ISO/PAS 25955:2026 -- Learn more
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DDI-Codebook v2.1

Published: 2005-06-16

XML Schema namespace (use in xsi:schemaLocation declaration if not using a local copy of the schema set): https://ddialliance.org/Specification/DDI-Codebook/2.1/XMLSchema/Version2-1.xsd

Added Coverage

  • Added Category Level (catLevel)
  • Added attributes catgry and level to Cateogry element (catgy)

 

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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.