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Re: [ddlm-group] Draft EBNF for CIF2

Hi James,

I would prefer that there be no self nesting of either save or data sections and that save sections
should be named.



On 8/21/14, 8:26 PM, James Hester wrote:
> Dear DDLm group,
> John Bollinger has reminded by of a further change: nested save frames, which were introduced in the STAR2 and DDLm papers, are
> included in the EBNF.  CIF1.1 only envisioned a single level of save frames, and only in dictionary files.  Absent a decision by
> this group or COMCIFS, the restriction of save frames to dictionary files (nested or otherwise) would continue.
> James.
> On Wed, Aug 20, 2014 at 4:33 PM, James Hester <jamesrhester@gmail.com <mailto:jamesrhester@gmail.com>> wrote:
>     Dear DDLm group,
>     John Bollinger and myself have put our heads together and produced an ISO 14977 EBNF specification of CIF2.0 syntax.  We were
>     working from the 10 August 2011 "CIF Changes" document agreed by this group and approved in Madrid, available in the archives of
>     this list at http://www.iucr.org/__data/iucr/lists/ddlm-group/pdf00001.pdf, with the following change:
>     (1) triple-quoted strings were returned to the specification as agreed in Montreal, in the form contained in the draft posted at
>     http://www.iucr.org/__data/assets/pdf_file/0020/59420/cif2_syntax_changes-jcb20110728.pdf
>     Please study the attached EBNF (plain text format) and advise of any errors, omissions or ambiguities.  Note that EBNF is
>     clearly not the best format for machine-generation of parsers, but it should be sufficiently precise and understandable to serve
>     as a foundation document for CIF2.
>     For those, such as myself, who have not seen the ENBF '-' operator before, the meaning of "A-B" is: all character sequences
>     satisfying A, except those that satisfy B.
>     My intention is to start producing documentation for CIF2 on the basis of this EBNF, so your earliest comments would be most
>     appreciated.
>     all the best,
>     James.
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John Westbrook, Ph.D.
RCSB, Protein Data Bank
Rutgers, The State University of New Jersey
Department of Chemistry and Chemical Biology
174 Frelinghuysen Rd
Piscataway, NJ 08854-8087
e-mail: jwest@rcsb.rutgers.edu
Ph: (848) 445-4290 Fax: (732) 445-4320
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