758 Resource Identifier

Field definition and scope:

Field 758 contains an identifier for a resource that is either the resource described in the bibliographic record or a resource to which it is related. Resources thus identified may include, but are not limited to, FRBR works, expressions, manifestations, and items.

The field does not prescribe a particular content standard or data model.

Field 758 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 758	Resource Identifier			R
Indicator:
First	Undefined; contains a blank	M
Second	Undefined; contains a blank	M

Subfield code:
$a	Label			NR
$i	Relationship information			R
$0	Authority record control number or standard number	O	O	R
$1	Real World Object URI			R
$2	Source of heading or term			NR
$3	Materials specified			NR
$4	Relationship			R
$5	Institution to which field applies			NR
$6	Linkage			NR
$8	Field link and sequence number			R

Content designator history:

Field 758 - Resource Identifier [new, 2017]

Subfield $2 - Source of heading or term [new, 2019]