Data Item _citation.id
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General 
- Item name
- _citation.id
- Category name
- citation
- Attribute name
- id
- Required in PDB entries
- yes
- Used in current PDB entries
- Yes, in about 100.0 % of entries
Item Description
The value of _citation.id must uniquely identify a record in the
CITATION list.
The _citation.id 'primary' should be used to indicate the
citation that the author(s) consider to be the most pertinent to
the first data instance, for example first series of fragmentss screened,
listed in the contents of the data block.
Note that this item need not be a number; it can be any unique
identifier.
Item Example1
primary
Item Example2
1
Item Example3
2
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*|+-]*
