042 Authentication Code (NR) (Variable Data Field)
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. All codes are recorded in lowercase alphabetic characters.
The National level record requirement for this field is Mandatory if applicable.
Field 042 is NOT repeatable .
Guidelines for applying content designators:
For indicator and subfield code definitions and examples, National-level (NLR) and Minimal-level (MLR) record requirements , and designator repeatability , see table below:
Position | Description | NLR | MLR | Repeatability |
Field 042 | Authentication Code | A | A | NR |
Indicator: | ||||
First | Undefined; contains a blank | M | ||
Second | Undefined; contains a blank | M | ||
Subfield code: | ||||
$a | M | M | R |
Subfield $a - Authentication code
nst - New Serial Titles (SE) [obsolete, 1984]
See also:
