Hold / 004 Related bibliographic record identifier
004 RELATED BIBLIOGRAPHIC RECORD IDENTIFIER Field definition This field contains an identifier of the bibliographic record for the item for which the holdings are reported. If the identifier is the record control number of the bibliographic record to which the holdings record is related, it is recommended that it be directly preceded by a standard designation for the institution or system by which it was assigned, enclosed in parentheses. Occurrence Mandatory. Not repeatable. Indicators In conformance with ISO 2709 this field does not have indicators.
Subfields In conformance with ISO 2709 this field does not contain subfields. Notes on field contents There are no restrictions on the form of the related bibliographic record identifier. The application is the same as field 001 RECORD IDENTIFIER defined in UNIMARC Manual: Bibliographic Format. Related Fields An agency may be using other separately identified numbers such as ISBN or National Bibliography Number as a Record Identifier. Examples EX 1 (PTBN)345231 Number of the bibliographic record to which the holdings record is related, preceded by the identifier for the National Library of Portugal, in parentheses. EX 2 ISBN 972-565-325-4 EX 3 ISSN 0374-5406 EX 4 (DLC)86-13927