545 Biographical or Historical Data

Field definition and scope:

Field 545 contains biographical information about an individual or historical information about an institution or event used as the main entry for the item being cataloged.

The National level record requirement for this field is Optional.

Field 545 is 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 545	Biographical or Historical Data	O	O	R
Indicator:
First	Type of data	M
#	No information provided	A
0	Biographical sketch	A
1	Administrative history	A

Second	Undefined; contains a blank	M

Subfield code:
$a	Biographical or historical data	M	O	NR
$b	Expansion	O	O	NR
$u	Uniform Resource Identifier	O	O	R
$6	Linkage	A	O	NR
$8	Field link and sequence number	O	O	R

Input conventions:

Punctuation

Content designator history:

Subfield $u - Uniform Resource Identifier [defined, 2000]: In 2000, subfield $u was defined to contain the Uniform Resource Identifier (URI).