Data Item _ihm_external_files.reference_id
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General 
- Item name
- _ihm_external_files.reference_id
- Category name
- ihm_external_files
- Attribute name
- reference_id
- Required in PDB entries
- yes
- Used in currrent PDB entries
- No
Item Description
A pointer to the source of the external file - either DOI or locally stored.
This data item is a pointer to _ihm_external_reference_info.reference_id in the
IHM_EXTERNAL_REFERENCE_INFO category.
Data Type 
- Data type code
- int
- Data type detail
- int item types are the subset of numbers that are the negative or positive integers.
- Primitive data type code
- numb
- Regular expression
- [+-]?[0-9]+
