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657  Index Term–Function (R)

Input Standards

1st Indicator  Undefined
blank character Undefined
2nd Indicator  Source of term
7 Source is specified in subfield ‡2
Subfields (R=Repeatable  NR=Nonrepeatable) Input Standards
‡a Function (NR) Mandatory/Mandatory
‡v Form subdivision (R) Required if applicable/Required if applicable
‡x General subdivision (R) Required if applicable/Required if applicable
‡y Chronological subdivision (R) Required if applicable/Required if applicable
‡z Geographical subdivision (R) Required if applicable/Required if applicable
‡0 Authority record control number (R) Optional/Optional
‡2 Source of term (NR) Mandatory/Mandatory
‡3 Materials specified (NR) Optional/Optional


An index term describing the activity or function that generated the described materials (e.g., property assessment or voter registration).

1st Indicator

Undefined. The 1st indicator position is undefined and contains a blank ( blank character ).

blank character


2nd Indicator

Source of term. The source of the index term is contained in subfield ‡2.


Source is specified in subfield ‡2. Terms based on specific subject authorities. Identify the source in subfield ‡2.


‡a Function

A term specifying the function or activity which generated the materials.

657   7 Personnel benefits management ‡x Industrial accidents ‡x Morbidity ‡x Vital statistics ‡z Love Canal, New York. ‡2 New York State Management Functions Index
‡v Form subdivision

A specific kind or genre of material defined by the thesaurus being used. Use only when a form subject subdivision is added to a term. Use subfield ‡x if the terms function as general subdivisions. A form subdivision in subfield ‡v is generally the last subfield in the field. Repeat subfield ‡v if you use more than one form subdivision.

657   7 Associate degrees ‡z Trinidad and Tobago ‡v Congresses. ‡2 ericd
‡x General subdivision

A subject subdivision that is not more appropriately contained in subfield ‡v, ‡y, or ‡z. Use subfield ‡x only when a general topical subdivision is added to a term.

657   7 Commencement Day ‡x Salem Academy ‡x Photographs. ‡2 local
‡y Chronological subdivision

A subject subdivision that represents a period of time. Use only when a chronological subject subdivision is added to a term.

657   7 Etchings ‡z Europe ‡y 20th century. ‡2 aat
‡z Geographical subdivision

A geographic subject subdivision. Use only when a geographic subject subdivision is added to a term.

657   7 Engravings ‡z France ‡z Strasbourg ‡y 1660. ‡2 rbgenr
‡0 Authority record control number

Subfield ‡0 (zero) contains the system control number of the related authority record or a standard identifier such as an International Standard Name Identifier (ISNI). The control number or identifier is preceded by the appropriate MARC Organization code (for a related authority record) or the Standard Identifier source code (for a standard identifier scheme), enclosed in parentheses. See MARC Code List for Organizations ( for a listing of organization codes and Standard Identifier Source Codes ( for code systems for standard identifiers. Subfield ‡0 is repeatable for different control numbers or identifiers.

Local authority identifiers may be entered in subfield ‡0 locally, but should not be added to master records in WorldCat.

‡2 Source of term

A MARC code that identifies the source list from which the index term was assigned. See Function Term Source Codes (

657   7 Doors & doorways ‡z Washington (D.C.) ‡y 1910-1920. ‡2 lctgm
‡3 Materials specified

The part of the described materials to which the field applies.


Field 657 prints as a heading and a tracing. Subfields ‡0, ‡2, and ‡3 do not print. In both the heading and tracing paragraphs, the print program supplies the display constant Function: before the subfield ‡a data. Do not enter Function: in field 657. In the tracing position, the display constant prints after the appropriate Arabic numeral. The print program supplies a period after the last printing subfield unless final punctuation (. ! ?) is present.

This page last revised: August 4, 2014