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. 2.2, p. 23

Section Lengths of data names and block codes

S. R. Halla* and J. D. Westbrookb Lengths of data names and block codes

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CIF imposes another length restriction that is not integral to the STAR File syntax: data names, data-block codes and frame codes may not exceed 75 characters in length. This is an increase over the 32-character limit of the original specification, although this extension had already been approved by COMCIFS to coincide with the release of version 2 of the core dictionary (see Chapter 3.2[link] ).

There is no fundamental technical reason underlying this restriction; it permits assignment of a fixed-length buffer for recording such data names within a software application, but perhaps more significantly, it encourages a measure of conciseness in the creation of data names based on hierarchical component terms.

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