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Re: Backus-Naur descriptions for STAR and CIF

  • Subject: Re: Backus-Naur descriptions for STAR and CIF
  • From: "Richard G. Ball" <richard_ball@xxxxxxxxx>
  • Date: Wed, 17 May 2000 18:12:35 +0100 (BST)
On May 17,  4:56pm, Brian McMahon wrote:

> > > What about designating the end of looped data with "stop_"?
> >
> > It is provided for within the BNF but not mandatory. Therefore its
> > presence or otherwise still makes for a consistent CIF.
>
> Hmm - vcif certainly chokes on "stop_" in a CIF. Nick, can you discuss this
> with Syd Hall? I suspect that many existing CIF applications, written by
> crystallographers who have only read the Acta paper, would break if they
hit
> a stop_.

A specific loop ending designator would simplify a lot of the record-based
CIF readers. If there was a supported "prettifier" which would insert such
elements then those who'd want to write a CIF-reader could rely on this more
structured format to make their programs simpler.

Richard

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Dr R.G. Ball                    |  voice: 732-594-5341
Merck Research Laboratories     |  fax: 732-594-6793 or 6100
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