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Re: imgCIF / CBF web pages


		Is CBF an extension of CIF or mmCIF?

	I have not checked what Andy has put on his web page, but, in
response to John Westbrook's message, it is important to point out that
CBF is, an fact, a CIF dictionary developed using DDL2 and not just an
extension of mmCIF.  It is a separate dictionary to be used in conjunction
with any other CIF dictionary.  The reason that the Brookhaven workshop
agreed to develop CBF using DDL2 rather than DDL1 was that the DDL2 to
DDL1 conversion was easier than the other way around.  Comcifs expects the
CBF working group to prepare a DDL1 as well as a DDL2 version so that CBF
can be used in conjunction with any CIF dictionary.  CBF must be
applicable in any situation where area detectors are used, not just in
those situations involving macromolecules.

	It is true that since it was decided that the initial development
would be under DDL2, CBF will be developed in close collaboration with
mmCIF, but CBF must not be seen as just an extension of mmCIF.  It is a
separate CIF dictionary of equal standing with the coreCIF, mmCIF and
pdCIF dictionaries.  Each of these is maintained separately, but
together they constitute a coordinated suite of dictionaries. 

			David Brown

				Chair of Comicfs


*****************************************************
Dr.I.David Brown
Brockhouse Institute for Materials Research, 
McMaster University, Hamilton, Ontario, Canada
Tel: 1-(905)-525-9140 ext 24710
Fax: 1-(905)-521-2773
*****************************************************

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