066 Character Sets Present

Field definition and scope:

Field 066 is used in records encoded with characters from sets other than ISO 10646 (or Unicode) to specify the character sets for data content that are present in the record. The field alerts users that special processing may be required.

Character sets are identified in field 066 by all but the first character of the escape sequences that designate the sets (the first character is the escape character, hex 1B). The characters that make up the escape sequences, as well as other details about character encoding of MARC records, are described in MARC 21 Specifications for Record Structure, Character Sets, and Exchange Media.

The National level record requirement for this field is Mandatory if applicable.

Field 066 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 066	Character Sets Present	A	A	NR
Indicator:
First	Undefined; contains a blank	M
Second	Undefined; contains a blank	M

Subfield code:
$a	Primary G0 character set	O	O	NR
$b	Primary G1 character set	O	O	NR
$c	Alternate G0 or G1 character set	M	M	R