International
Tables for
Crystallography
Volume G
Definition and exchange of crystallographic data
Edited by J. R. Hester and B. McMahon

© International Union of Crystallography 2026
International Tables for Crystallography (2026). Vol. G. Early view chapter
https://doi.org/10.1107/97809553602060001022

Chapter 4.13 DDLm dictionary

Sydney R. Halla, Nick Spadaccinia and James R. Hesterb

aSchool of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, 6009 Perth, Australia, and bAustralian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia.

This is version 4.2.0 of the methods-supporting dictionary definition language (DDLm). It provides a machine-readable description of the attributes of data items in the core CIF and related dictionaries. This version of DDL is described in Chapter 2.4.

Keywords: Crystallographic Information Framework; CIF dictionaries; dictionary definition language; DDLm; DDLm dictionary; data attributes; data names; data categories; methods.

This chapter is in preparation








































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