Field definition and scope:

Field 042 contains one or more authentication codes indicating that the record, existing in a national database, has been reviewed in a specific way.  Field 042 is an agency-assigned data element.  It is used for authentication codes associated with specifically designated authenticating agencies.

A listing of authentication codes for field 042 is available at:  Value Lists for Codes and Controlled Vocabularies (MARC Authentication Action Code List).

The National level record requirement for this field is Optional.

Field 042 is NOT repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National level (NLR) record requirements, and designator repeatability, see table below:

Position

Description

NLR

Repeatability

Field 042

Authentication Code

O

NR

Indicator:

 

 

 

First

Undefined; contains a blank

M

 

Second

Undefined; contains a blank

M

 

 

 

 

 

Subfield code:

 

 

 

$a

Authentication code

M

R

Input conventions:

Capitalization

LC Guidelines:

 042  Authentication Code

DCM Z1 Instructions:

 042  Authentication Code

Related MARC field or document:

Value Lists for Codes and Controlled Vocabularies:

MARC Authentication Action Code List

See also:

0XX  Numbers and Codes

Variable Data Fields