DDI-Codebook v1.x
Published: 2001-01-11 with minor revisions through 2002-07-15
Content:
- Descriptive documentation of the content, meaning, provenance, and access for a single data set
- Archival preservation of descriptive content
- Input basis for more complex descriptions
- Input content for discovery and exchange of data at the study, data file, variable, and question level
- Input content for a structured human-readable codebook for the data set as a whole
- Populate variable and question banks to explore available data and question structures for reuse in new surveys
- Early versions published with copyright @ DDI Alliance
Download
Structured, descriptive documentation of the content, meaning, provenance, and access for a single data set. Originally developed as an XML DTD, 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.
Version 1.0 was the first published version of DDI. Versions 1.02, 1.02.1, and 1.3 were used to test and finalize new content covering aggregate (tabular) data as nCubes and the expansion of geographic content to better align with geospatial standards and search systems.
DDI change log reported in the DTD structure.
Version 1.2.2 was created by NESSTAR and retained some features of earlier DDI versions, while omitting support for nCubes, and making certain changes in support for the structure of string content.
Table providing comparison of content changes among official 1.x DDI versions and the NESSTAR version 1.2.2 - this table was prepared by Wendy Thomas 2026-04-15.
-
Version 1.0 DTD
-
Version 1.02.1 DTD
-
Version 1.3 DTD
-
Version 1.2.2 XSD
-
README.txt
Version DTD's were regenerated from Version 2.0 based on changes listed within the DTD. This work was done by Wendy Thomas 2026-04-15.