Tables for
Volume G
Definition and exchange of crystallographic data
Edited by S. R. Hall and B. McMahon

International Tables for Crystallography (2006). Vol. G, ch. 3.1, p. 79

Section Dictionary identification

B. McMahona*

aInternational Union of Crystallography, 5 Abbey Square, Chester CH1 2HU, England
Correspondence e-mail: Dictionary identification

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Dictionary files must contain information that unambiguously states their identity and version. In DDL2-based dictionaries this is done using the dictionary attributes described in Section[link] . The name of the data block comprising the whole content of a DDL2 dictionary is by convention the same as the dictionary identification string given as _dictionary.title. This value is repeated as the value of _dictionary.datablock_id (see Example[link]) for use in checking the consistency of the dictionary.

Example DDL2 dictionary identification entries.

[Scheme scheme10]

The dictionary history is also an important audit record of changes to the dictionary content. Unlike in DDL1-based dictionaries where the history is contained in a single field, DDL2 provides a looped list of version labels, dates and annotations. For convenience, the history records in large DDL2-based dictionaries are sometimes placed at the end of the dictionary file.

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