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Re: Core CIF - revision to accommodate Acta C Notes for Authors



Helen Berman telephoned to say that she was taken aback by the raft of
apparently new data names listed in circular 76. These were originally
posted in circular 54 (following Syd Hall's wish to introduce them into
the Acta C Notes for Authors at the beginning of this year), and their
formal approval was moved to the back burner while we concentrated on the
pdCIF and mmCIF dictionaries. A couple of points arise from this
conversation:

(1) the records of previous discussions within COMCIFS should be available
for perusal (they are; at the URL http://www.iucr.org/cif/comcifs/minutes/,
which I periodically re-post), but that it would be helpful if they were
indexed or somehow better structured (see D78.4 below);

(2) the core dictionary once again is beginning to diverge from the image of
the core in DDL2 formalism within the mmCIF dictionary. For now, this can be
managed manually (since many of the "new" datanames are effectively
re-namings of existing entries, these are rather easily handled within DDL2
by the alias mechanism). However, in the longer term, it would be better to
cleave off the core from the body of the mmCIF dictionary, and have it
maintained in both DDL1 and DDL2 formalism by the same COMCIFS subcommittee.
(This is one of the objectives of the dictionary management working group,
who will soon be in a position to present their report to COMCIFS.)



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