Data Item _pdbx_reference_entity_link.link_class
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General 
- Item name
- _pdbx_reference_entity_link.link_class
- Category name
- pdbx_reference_entity_link
- Attribute name
- link_class
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
- Used in the BIRD dictionary
- Yes
Item Description
A code indicating the entity types involved in the linkage.
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*|+-]*
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| NN | non-polymer non-polymer |
| NP | non-polymer polymer |
| PN | polymer non-polymer |
| PP | polymer polymer |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| NN | non-polymer non-polymer |
| NP | non-polymer polymer |
| PN | polymer non-polymer |
| PP | polymer polymer |