Discussion List Archives

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [ddlm-group] CIF-2 changes

Title: Re: [ddlm-group] CIF-2 changes

Unfortunately David there seems to be a (yet confirmed) expectation that the existing CIF1 data names can be used in a new DDLm/dREL world. Hence the dilemma.

On 10/11/09 10:53 PM, "David Brown" <idbrown@mcmaster.ca> wrote:

Surely dREL is not compromised by what have been used as datanames in the past.  dREL apppears only in CIF2 dictionaries and uses only the standard datanames that appear in the CIF2 dictionaries.  The only place where it is necessary to be concerned about [] and / appearing in datanames is when reading in CIF1 data files.  All the datanames that appear in the  CIF1 dictionaries are aliased in the CIF2 dictionaries. This means that the the abilitiy to read datanames containing [] and / is only required when reading in CIF1 data files, not when reading dictionaries (the old datanames only appear in CIF2 dictionaries as delimited values in the _alias loops).  At the point where the CIF value of _sint/lambda is read in, its internal name has in any case to be equivalenced to the CIF2 dictionary name (_sintoverlambda) which is data name used in the dREL stantements.  Thus we are still free to place any limitations we choose on the datanames used in dREL (except for _ and . which, being punctuation, may cause problems with the names used in programming languages).  However, the CIF2 dictionaries also define a _description.common dataname that contains only letters (and numbers?) and these names could be used just as easily in dREL if that were an advantage.

David


_______________________________________________
ddlm-group mailing list
ddlm-group@iucr.org
http://scripts.iucr.org/mailman/listinfo/ddlm-group

cheers

Nick

--------------------------------
Associate Professor N. Spadaccini, PhD
School of Computer Science & Software Engineering

The University of Western Australia    t: +61 (0)8 6488 3452
35 Stirling Highway                    f: +61 (0)8 6488 1089
CRAWLEY, Perth,  WA  6009 AUSTRALIA   w3: www.csse.uwa.edu.au/~nick
MBDP  M002

CRICOS Provider Code: 00126G

e: Nick.Spadaccini@uwa.edu.au


_______________________________________________
ddlm-group mailing list
ddlm-group@iucr.org
http://scripts.iucr.org/mailman/listinfo/ddlm-group

Reply to: [list | sender only]
International Union of Crystallography

Scientific Union Member of the International Council for Science (admitted 1947). Member of CODATA, the ICSU Committee on Data. Member of ICSTI, the International Council for Scientific and Technical Information. Partner with UNESCO, the United Nations Educational, Scientific and Cultural Organization in the International Year of Crystallography 2014.

ICSU Scientific Freedom Policy

The IUCr observes the basic policy of non-discrimination and affirms the right and freedom of scientists to associate in international scientific activity without regard to such factors as ethnic origin, religion, citizenship, language, political stance, gender, sex or age, in accordance with the Statutes of the International Council for Science.