Items for fast track approval

[David Brown]

Dear Colleagues,


We have had two suggestions for fast track changes to the core CIF 
dictionary.

These are:

1. A new enumeration value for _atom_sites_solution_:

              'iterative'

which may be defined as:

'iterative algorithm, e.g. charge flipping (Oszlanyi and Suto, 2004. 
Acta Cryst. A60, 134-141)'

(Contributed by Arie van der Lee)
 


2. A new enumeraton value for _atom_sites_solution_hydrogens,

              'mixed'

which may be defined as:

'a mixture of "geom" and "difmap"'

This enumeration is currently widely, though illegaly, used.  As 
validating programs become increasingly strict in their interpretation 
of CIF rules, this enumeration will have to be added to ensure that the 
archive of CIFs can be properly read.

Contriburted by David Watkin



According to the fast track rules these suggestions are open for comment 
from members of the core CIF Dictionary Maintenance Group and others for 
six weeks.  After this time, if there are no unresolved issues, the 
suggestions will be passed to COMCIFS for final appproval.

Please respond by March 18.  Failure to respond by this date is taken as 
approval.

David Brown
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