Record Type |
||
BIB, LBD |
||
Input Standards |
||
Field (Full/Minimal) | ||
Optional/Optional | ||
1st Indicator Level of subject | ||
![]() |
No information provided | |
0 | No level specified | |
1 | Primary | |
2 | Secondary | |
2nd Indicator Thesaurus | ||
![]() |
No information provided |
|
0 | Library of Congress subject heading | |
1 | LC subject heading for children's literature | |
2 | Medical subject heading | |
3 | National Agricultural Library subject authority file | |
4 | Source not specified | |
5 | Canadian subject heading | |
6 | Répertoire de vedettes-matière | |
7 | Source is specified in subfield ǂ2 | |
Subfields (R=Repeatable NR=Nonrepeatable) | Input Standards (Full/Minimal) | |
ǂa | Topical term or geographic name as entry element (NR) | Mandatory/Mandatory |
ǂb | Topical term following geographic name as entry element (NR) | Required if applicable/Required if applicable |
ǂc | Location of event (NR) | Optional/Optional |
ǂd | Active dates (NR) | Optional/Optional |
ǂe | Relator term (NR) | Optional/Optional |
ǂg | Miscellaneous information (R) | Required if applicable/Required if applicable |
ǂv | Form subdivision (R) | Required if applicable/Required if applicable |
ǂx | General subdivision (R) | Required if applicable/Required if applicable |
ǂy | Chronological subdivision (R) | Required if applicable/Required if applicable |
ǂz | Geographic subdivision (R) | Required if applicable/Required if applicable |
ǂ1 | Real World Object URI (R) | Optional/Optional |
ǂ2 | Source of heading or term (NR) | Required if applicable/Required if applicable |
ǂ3 | Materials specified (NR) | Optional/Optional |
ǂ6 | Linkage (NR) | System supplied/System supplied |
ǂ8 | Field link and sequence number (R) | Optional/Optional |
ǂ9 | Special entry (NR) | Optional/Optional |
Definition |
A locally devised topical subject used as a subject added entry. Use field 690 only for topical subject entries not based on LC, AC, NLM, NAL, NLC or Sears or for topical subject entries based on nonstandard applications of these authorities. Use field 650 if the topical subject entry is based on LC, AC, NLM, NAL, NLC or Sears. A topical subject added entry consists of a general subject term including the name of an event or object. See field 650 for more information. |
||||||||||||||||||||||
WorldCat record retention | Field 690 is not retained in the WorldCat record. However, it is retained in exported records and records delivered via other services. |
||||||||||||||||||||||
1st Indicator |
Level of subject. The level of the subject entry. Use the 1st indicator to distinguish primary and secondary descriptors. |
||||||||||||||||||||||
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
2nd Indicator |
Thesaurus. The thesaurus or subject heading system used in constructing the subject heading. As a result of RLG integration, field 690 has been modified to allow thesaurus information. |
||||||||||||||||||||||
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
Subfields |
|||||||||||||||||||||||
ǂa Topical term or geographic name as entry element | A locally devised topical subject or geographic name used as an entry element for a topical term. Enter parenthetical qualifying information associated with the term also in subfield ǂa.
|
||||||||||||||||||||||
ǂb Topical term following geographic name as entry element | A topical term that is entered under a geographic name in subfield ǂa. |
||||||||||||||||||||||
ǂc Location of event | The location at which an event occurred. |
||||||||||||||||||||||
ǂd Active dates | The time during which an event occurred.
|
||||||||||||||||||||||
ǂe Relator term | A term that specifies the relationship between the topical heading and the described materials, e.g., subject. |
||||||||||||||||||||||
ǂg Miscellaneous information | Data element that is not more appropriately contained in another defined subfield. |
||||||||||||||||||||||
ǂv 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 main term. Use subfield ǂv also for form terms when they function as indicated above. Use subfield ǂx if the terms function as general subdivisions. A form subdivision in subfield ǂv is generally the last subfield in the field. Repeat subfield ǂv if you use more than one form subdivision. |
||||||||||||||||||||||
ǂx General subdivision | A subject subdivision that is not more appropriately contained in subfield ǂv, ǂy or ǂz. Use subfield ǂx only when a general topical subdivision is added to a main term.
|
||||||||||||||||||||||
ǂy Chronological subdivision | A subject subdivision that represents a period of time. Use only when a chronological subject subdivision is added to a main term. |
||||||||||||||||||||||
ǂz Geographic subdivision | A geographic subject subdivision. Use only when a geographic subject subdivision is added to a main term. |
||||||||||||||||||||||
ǂ1 Real World Object URI | For information about subfield ǂ1, see Control Subfields. |
||||||||||||||||||||||
ǂ2 Source of heading or term | A MARC code that identifies the source list from which the heading in a subject added entry was assigned. Use only when the 2nd indicator value is 7. See MARC Code Lists for Relators, Sources, Descriptive Conventions. |
||||||||||||||||||||||
ǂ3 Materials specified | For information about subfield ǂ3, see Control Subfields. |
||||||||||||||||||||||
ǂ6 Linkage | Data that link fields when non-Latin script is entered. This subfield is system supplied and does not appear in OCLC online displays. Do not manually add subfield ǂ6. For more information about subfield ǂ6, see Control Subfields. |
||||||||||||||||||||||
ǂ8 Field link and sequence number | For information about subfield ǂ8, see Control Subfields. |
||||||||||||||||||||||
ǂ9 Special entry | For information about subfield ǂ9, see Control Subfields. |
||||||||||||||||||||||
Indexing |
Field 690 is not indexed. |
||||||||||||||||||||||
MARC 21 |
Field 690 is OCLC-defined and therefore not included in MARC 21 Format for Bibliographic Data. |
This page last revised: December 28, 2020