Crystallographic Information Framework

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DDL dictionary version 1.4.1




   Character string which identifies the natural grouping of data
   items to which the specified data item belongs. If the data
   item belongs in a looped list, then it must be grouped only with
   items from the same category, but there may be more than one
   looped list of the same category provided that each loop has its
   own independent reference item (see _list_reference).

Type: char

Category: category