General 
- Item name
- _pdbx_deposit_group_index.pdb_id_code
- Category name
- pdbx_deposit_group_index
- Attribute name
- pdb_id_code
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description 
Data Type 
- Data type code
- code
- Data type detail
- code item types/single words ...
- Primitive data type code
- char
- Regular expression
- [][_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]*
- Internal data item
- Yes