id 

The value of attribute id in category entity must uniquely identify a record in the
 ENTITY list.

Note that this item need not be a number; it can be any unique
identifier.

Attribute Information

Used By

Element PDBx:entityType/PDBx:entity

Source 

<xsd:attribute name="id" use="required" type="xsd:string">
  <xsd:annotation>
    <xsd:documentation xml:lang="en">The value of attribute id in category entity must uniquely identify a record in the ENTITY list. Note that this item need not be a number; it can be any unique identifier.</xsd:documentation>
  </xsd:annotation>
</xsd:attribute>

Sample