Data Item _category.id
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General 
- Item name
- _category.id
- Category name
- category
- Attribute name
- id
- Required in PDB entries
- yes
- Used in currrent PDB entries
- No
Item Description
The identity of the data category. Data items may only be looped
with items of the same category.
Data Type 
- Data type code
- idname
- Data type detail
- A data item name component or identifier
- Primitive data type code
- uchar
- Regular expression
- [_A-Za-z0-9]+
Child Data Items 
- _category_examples.id
- _category_group.category_id
- _category_key.id
- _category_methods.category_id
- _item.category_id
- _ndb_category_description.id
- _ndb_category_examples.id
- _pdbx_category_conditional_context.category_id
- _pdbx_category_context.category_id
- _pdbx_category_description.id
- _pdbx_category_examples.id
- _pdbx_item_linked_group.category_id