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910  Local Data (NR)

Record Type


Input Standards

Field (Full/Minimal)
1st Indicator  Undefined
blank character Undefined
2nd Indicator  Undefined
blank character Undefined
Subfields (R=Repeatable  NR=Nonrepeatable) Input Standards (Full/Minimal)
ǂa Local data (NR) Mandatory/Mandatory


Local data. Formerly defined as User-Option Data, field 910 is not part of the standard MARC 21 format. You may use this field to meet your local needs. Before incorporating any local field into your cataloging workflow, contact your local system vendor. Indiscriminate or inconsistent use of a local field may adversely affect the consolidation of records and local data needed in the creation of a local system database.

Field 910 does not remain in the WorldCat record. It is retained in exported records and records delivered via other services.

Fields 901-907 and 945-949 may also be used for local data. They are repeatable and include the ability to define subfields as needed.

For information on punctuation, see the Punctuation section below.

1st Indicator

Undefined. The 1st indicator position is undefined and contains a blank.

blank character


2nd Indicator

Undefined. The 2nd indicator position is undefined and contains a blank.

blank character



ǂa Local data

Institution-specific information formulated to meet your local needs.


Include or omit punctuation as needed.

For more information on punctuation, including OCLC policy, see section 2.8, Punctuation.


Field 910 is not indexed.


Field 910 is OCLC-defined and therefore not included in MARC 21 Format for Bibliographic Data.

This page last revised: August 27, 2020