Hi!

First off, I strongly suggest trying the development “master” from Git, which 
has a number of improvements to CIF support.

> The following three points would need to be addressed:
> 1. Instead of Cartesian coordinates, fractional coordinates must be used in 
> the .cif file.
> 2. The space-group symmetry must be added to the .cif file.
> 3. Ideally, only the asymmetric unit must be retained in the .cif file, 
> ideally with the same atoms and in the same order as the original cif file 
> (before energy-minimisation), but that information is probably lost.

I’m fairly confident that #1 and #2 are addressed. I’m about 80% confident #3 
is already addressed, but if not it’s fairly easy to address the code.

> I have ample experience with scientific software development (C++ and 
> FORTRAN) within the crystallographic field so I would be able to provide e.g. 
> algorithms, but I have never used OpenBabel before and I have never seen the 
> source code, so I would need help.

We can *definitely* help you. First off, get the Git repository:
https://github.com/openbabel/openbabel

Try compiling that. I don’t see the space group support in 
src/formats/casstepformat.cpp but with an example file and a few minutes with 
C++ that can be solved.

Thanks and best regards,
-Geoff
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