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[ddlm-group] LOOP versus LIST

• To: Group finalising DDLm and associated dictionaries <ddlm-group@iucr.org>
• Subject: [ddlm-group] LOOP versus LIST
• From: Joe Krahn <krahn@niehs.nih.gov>
• Date: Tue, 05 Jan 2010 12:41:16 -0500

I assume that a list of items defined via a loop is distinct from a list 
of items defined by a list. Is that correct?

Likewise, is a list of one item distinct from a scalar value?

Currently, CIF files don't differentiate between a one-element loop and 
a scalar. For example, RCSB components.cif does not use loops for atom 
data when there is only one atom. Is this stated anywhere?

Also, is an empty string a valid TABLE index? Other CIF names require at 
least one character, but my understanding is that a TABLE index is any 
valid string, which includes an empty string. Strings are also 
case-sensitive, so I assume that TABLE indices are also case-sensitive.

Thanks,
Joe Krahn
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