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Time to drop STAR?

  • To: "Discussion list of the IUCr Committee for the Maintenance of the CIF Standard (COMCIFS)" <comcifs@iucr.org>
  • Subject: Time to drop STAR?
  • From: Joe Krahn <krahn@niehs.nih.gov>
  • Date: Tue, 13 Mar 2007 10:06:11 -0400
The CIF specifications could be simplified by dropping all of the
discussion about differences to STAR. With bracket delimiters and
possible MIME-based text, CIF will no longer be a subset of STAR anyhow.

Also, it would be nice to finalize other STAR left-overs like nested
loops. I noticed that the mmCIF NMR extension already uses nested loops.
Therefore, I think the best solution is to include nested loops in the
CIF syntax, but leave them as optional features, similar to the way
parsing of save-frames is not a mandatory feature. Likewise, GLOBAL_
should probably be dropped, or included as optional, possibly with
different rules from STAR.

I think it would also be good to allow nested save frames as an optional
extension, depending on whether anybody else thinks it is a useful idea.

Joe Krahn
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