666 General Explanatory Reference

Field definition and scope:

Field 666 contains text that explains how names having a common characteristic (e.g., surnames with separately written prefixes) are entered in a file.

Field 666 is appropriate only in an untraced reference record.

The 1XX field in the record contains the unestablished data element referred from.

Field 666 contains the explanatory information.

The heading in the 1XX field is not traced in a 4XX field in any established heading record for names beginning with the specified characteristic.

See example under the description of subfield $a (General explanatory reference).

A cross reference display may be generated from the 1XX and 666 fields of the reference record. A reference instruction phrase is incorporated into the text of subfield $a. Examples of complex cross reference displays are provided in Reference Note Fields: Complex Cross References.

The National level record requirement for this field is Optional.

Field 666 is NOT repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National level (NLR) record requirements, and designator repeatability, see table below:

Position	Description	NLR	Repeatability
Field 666	General Explanatory Reference - Name	O	NR
Indicator:
First	Undefined; contains a blank	M
Second	Undefined; contains a blank	M

Subfield code:
$a	General explanatory reference	M	R
$6	Linkage	A	NR
$8	Field link and sequence number	O	R

See: Example for this field.

Input conventions:

Reference record fields

Punctuation

LC Guidelines:

666 General Explanatory Reference - Name