Crystallographic Information Framework

CYCLOPS version 2


CYCLOPS (Hall, 1993; Bernstein & Hall, 1998) was written specifically to address the problem of validating CIF data names. Its use extends beyond simply identifying data names in a CIF data file and checking that they are defined in a dictionary. Any ASCII file may be input, allowing for the checking of CIF data names in any text documents or program source.


If you wish to install and use this software you should download the most up-to-date version from the above Web site. The links below are to copies which are suitable for browsing or for use if the primary Web site is not available. However, they may be out of date and lack the full functionality of the latest version.


This is version 2.1.4 of May 1997. The software is under active maintenance and a revised version is envisaged to accommodate the CIF 1.1 specification.

Language and platform

The software is written in Fortran77 and should compile and run in a command-line environment on any common operating system with a suitable Fortran compiler.


  • Installation: The application requires CIFtbx. It is provided as part of the standard distribution of CIFtbx and may already have been installed when the library was installed. If not, copy the selected archive (cyclops.cshar.Z or cyclops.shar.Z - only one is required) into the parent directory of the ciftbx.src directory that stores the CIFtbx source files. In this directory, uncompress the selected archive and execute it with the C or Bourne shell as appropriate. Unpacking the archive creates a source directory; change to this and make the library.
     cp cyclops.shar.Z /x/y/base
    cd /x/y/base
    uncompress cyclops.shar.Z
    sh cyclops.shar.Z
    cd cyclops.src
    make all
    make test
  • General information: README file (HTML format)
  • Summary of use: Reading, Writing and Validating CIFS using CIFtbx2, cif2cif and Cyclops

Terms and conditions of use

Copyright in the software © the authors.
Authors: H. J. Bernstein and S. R. Hall

The software is distributed here under an open-source license. Queries concerning any use not covered under this license should be directed to


Bernstein, H. J. & Hall, S. R. (1998). CIF applications. VII. CYCLOPS2: extending the validation of CIF data names. J. Appl. Cryst. 31, 278-281. [details] Software available at

Hall, S. R. (1993). CIF applications. III. CYCLOPS: for validating CIF data names. J. Appl. Cryst. 26, 480-481. [details]

Hall, S. R. & Bernstein, H. J. (1996). CIF applications. V. CIFtbx2: extended tool box for manipulating CIFs. J. Appl. Cryst. 29, 598-603. [details]