This is an archive copy of the IUCr web site dating from 2008. For current content please visit
https://www.iucr.org
.
CIF Specification
Detailed specification Version 1.1
The original paper describing the CIF standard
Important note of change to the CIF standard specification:
As of release 2 of the Core CIF dictionary, data names may be greater than 32 characters in length. See the
differences file
on the Core CIF page for details.
Placeholders for unknown and inapplicable values
Format of date/time strings
Format of telephone/fax numbers
Format of proper names
Recommended abbreviations within data names
Reserved prefixes for local dictionary extensions
Copyright © International Union of Crystallography
IUCr Webmaster