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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 v2.5

Published: 2012-01-17 Update: 2014-01-29

 Current Field Level Documentation  

XML Schema namespace (use in xsi:schemaLocation declaration if not using a local copy of the schema set):  https://ddialliance.org/Specification/DDI-Codebook/2.5/XMLSchema/codebook.xsd 

Added Coverage

  • Controlled Vocabulary section to support use of external controlled vocabularies in any element or attribute
  • Coding instructions at the study description level
  • Collector training
  • Data processing
  • Ex-Post evaluation
  • Instrument development
  • Quality statement
  • Sample frame
  • Source citation
  • Study authorization
  • Study budget
  • Target sample size
  • File citation at file description level
  • Controlled vocabulary for response domain type and representation type

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DDI-Codebook is a light-weight version of the standard and has limited requirements in terms of identification requirements. It is intended primarily to document simple survey data. It also supports the description of dimensional data (DDI nCubes). Originally DTD-based, DDI-C is also available as an XML Schema.

DDI Codebook Version 2.5 was modified on January 29, 2014. This is a sub-minor version change (version 2.5.1) which DOES NOT change the namespace of DDI-C. Modifications corrected an omission of DataFingerprint from 2.5, relaxed cardinality to support multiple languages, and expanded the documentation