DDI-Codebook v2.5

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

DDI-Codebook is a more light-weight version of the standard, intended primarily to document simple survey data. 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

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