DDI-Codebook v2.6

Structured, descriptive documentation of the content, meaning, provenance, and access for a single data set. Originally developed as an XML DTD, DDI-Codebook retains the hierarchical structure of a DTD in describing the contents of a descriptive codebook for a data set including: identification, authorship, ownership, purpose, background methodologies, source information, provenance, quality control, access, physical file structures, variables/variable groupings, and related materials. Extensive information is found within the variable description covering the data source, derivation activity, representation, data typing, variable role, and restrictions.

Added Coverage

• Expansion of the use of concept and conceptualText to support the use of Controlled Vocabularies 
• Addition of vocabularyInstanceURI and vocabularyInstanceCode to identify specific entries within a Controlled Vocabulary
• Addition of personal identifiers and affiliations for all individual and organizational name fields
• Support for more detailed use of SDTL