Chapter 4.10 DDL2 dictionary

Definition and exchange of crystallographic data

First Online Edition (2006)

Part 4. Data dictionaries

  1. J. D. Westbrook1,
  2. S. R. Hall2

Published Online: 1 JAN 2006

DOI: 10.1107/97809553602060000750

International Tables for Crystallography

International Tables for Crystallography

How to Cite

Westbrook, J. D. and Hall, S. R. 2006. DDL2 dictionary. International Tables for Crystallography. G:4:4.10:473–478.

Author Information

  1. 1

    Protein Data Bank, Research Collaboratory for Structural Bioinformatics, Rutgers, The State University of New Jersey, Department of Chemistry and Chemical Biology, 610 Taylor Road, Piscataway, NJ 08854-8087, USA

  2. 2

    School of Biomedical and Chemical Sciences, University of Western Australia, Crawley, Perth, WA 6009, Australia

Publication History

  1. Published Online: 1 JAN 2006


This is version 2.1.3 of the dictionary definition language (DDL2). It provides a machine-readable description of the attributes of data items in the mmCIF and related dictionaries. This version of DDL is described in Chapter 2.6.


  • crystallography;
  • CIF;
  • CIF dictionaries;
  • Crystallographic Information File;
  • dictionary definition language;
  • data names;
  • data categories;
  • DDL2