753 System Details Access to Computer Files

Field definition and scope:

Field 753 contains information on the technical aspects of a computer file and any accompanying material that may be used to select and arrange the record with other records in a printed index.

This field is used for the type of machine, operating system, and/or programming language. This kind of added entry is assigned according to various cataloging rules to give access to the bibliographic record which otherwise would not be possible and to facilitate the capability of selecting and arranging records for production of printed indexes.

The National level record requirement for this field is Optional.

Field 753 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 753	System Details Access to Computer Files	O	O	R
Indicator:
First	Undefined; contains a blank	M
Second	Undefined; contains a blank	M

Subfield code:
$a	Make and model of machine	M	O	NR
$b	Programming language	A	O	NR
$c	Operating system	A	O	NR
$0	Authority record control number or standard number			R
$1	Real World Object URI			R
$2	Source of term			NR
$6	Linkage	A	O	NR
$8	Field link and sequence number	O	O	R

Input conventions:

Punctuation

Content designator history:

Subfield $0 - Authority record control number of standard number [new, 2016]

Subfield $1 - Real World Object URI [new, 2017]

Subfield $2 - Source of term [new, 2016]