Data Category sub_category
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General 
- Category name
- sub_category
- Required in PDB entries
- no
- Category group membership
- ddl_group sub_category_group
- Used in current PDB entries
- No
Category Relationship Diagrams 
View full category relationship diagram including all dictionary data categories
Category Description
The purpose of a sub-category is to define an association between
data items within a category and optionally provide a method to
validate the collection of items. The sub-category named
'cartesian' might be applied to the data items for the coordinates
x, y, and z.
