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Global section in CIF headers
- To: "Discussion list of the IUCr Committee for the Maintenance of the CIFStandard (COMCIFS)" <comcifs@iucr.org>
- Subject: Global section in CIF headers
- From: Joe Krahn <krahn@niehs.nih.gov>
- Date: Tue, 08 Sep 2009 11:28:20 -0400
I have been thinking that it makes sense to allow a global_ block as part of a CIF file. Globals have been excluded because they don't fit very well into the data model, but it might be useful to allow them to provide general format hints to the parser. My idea is that a common low-level parser could be used for mmCIF, CIF, and possibly other STAR variants. The global_ header would define parsing rules for the file, including possible future revisions of the same format, but not be considered part of the actual mmCIF data. For example: global_ _format mmCIF _version 1.2 In a way, this just replaces the initial comment-embedded CIF identifier, but I have always dislike the idea of a comment containing data. This approach could be more detailed, depending on how much the CIF/mmCIF format changes over time. Will it ever include STAR 2.0 bracketed lists? Will they ever directly include Unicode text? Joe Krahn
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