Data Item _category_key.id
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General 
- Item name
- _category_key.id
- Category name
- category_key
- Attribute name
- id
- Required in PDB entries
- implicit
- Used in currrent PDB entries
- No
Item Description
The identifier of the category (eg. a component of the primary key).
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]+
