Discussion List Archives

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

Re: [Cif2-encoding] Splitting of imgCIF and other sub-topics..... .. .

Hi Brian,

On Thursday, September 16, 2010 8:18 AM, you wrote:
[...]
>I favour the specification *recommending* a magic string to begin a
>file: an optional BOM followed by the 11 characters
>
>#\#CIF_2.0<whitespace>

Can you expand on that a bit?  Ignoring all considerations of character encoding, CIF 2.0 syntax is not 100% backwards compatible with CIF 1 syntax.  (Handling of quoted strings is the most prominent area of incompatibility, but there are others.)  If a CIF processor is presented with a file having no version identification comment, then which syntax would you want it to assume?

[...]

>These are recommendations, not requirements,
>
>1. to include existing CIF1.0 and CIF1.1 instances as valid CIF input
>streams (whether "decorated" or not;

Making the version comment optional in CIF2, as you suggest, would make *most* well-formed CIF1 instances also be well-formed CIF2 instances -- but not all of them.  Making CIF2 accommodate all of CIF1 would require substantial changes to those parts of the draft that we have considered settled.  Is it that important to you?


Thanks,

John
--
John C. Bollinger, Ph.D.
Department of Structural Biology
St. Jude Children's Research Hospital


Email Disclaimer:  www.stjude.org/emaildisclaimer

_______________________________________________
cif2-encoding mailing list
cif2-encoding@iucr.org
http://scripts.iucr.org/mailman/listinfo/cif2-encoding

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.