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MARC 21 Concise Authority: Heading Linking Entry Fields (7XX)
Fields 700-788 contain information that provides a machine link within a system between equivalent headings whether they are structured in the same or different form, are from the same or different authority files or printed thesauri, or whether they exist as separate authority records.
- HEADING LINKING ENTRIES--GENERAL INFORMATION
- 700 - ESTABLISHED HEADING LINKING ENTRY--PERSONAL NAME (R)
- 710 - ESTABLISHED HEADING LINKING ENTRY--CORPORATE NAME (R)
- 711 - ESTABLISHED HEADING LINKING ENTRY--MEETING NAME (R)
- 730 - ESTABLISHED HEADING LINKING ENTRY--UNIFORM TITLE (R)
- 748 - ESTABLISHED HEADING LINKING ENTRY--CHRONOLOGICAL TERM(R)
- 750 - ESTABLISHED HEADING LINKING ENTRY--TOPICAL TERM(R)
- 751 - ESTABLISHED HEADING LINKING ENTRY--GEOGRAPHIC NAME(R)
- 755 - ESTABLISHED HEADING LINKING ENTRY--GENRE/FORM TERM(R)
- 780 - SUBDIVISION LINKING ENTRY--GENERAL SUBDIVISION (R)
- 781 - SUBDIVISION LINKING ENTRY--GEOGRAPHIC SUBDIVISION(R)
- 782 - SUBDIVISION LINKING ENTRY--CHRONOLOGICAL SUBDIVISION(R)
- 785 - SUBDIVISION LINKING ENTRY--FORM SUBDIVISION (R)
- 788 - COMPLEX LINKING ENTRY DATA(NR)
Information for Translators and Other Users
Items highlighted in red indicate changes made after
the 2003 edition of the MARC 21 Concise Formats was published and are
included
in the 2004 printed edition
of the MARC 21 Concise Formats.
HEADING LINKING ENTRIES--GENERAL INFORMATION
The inclusion of a linking entry field in an established heading or established heading and subdivision record for a name, name/title, uniform title, topical term, form term, or extended subject heading or in an established heading record for an authorized subject subdivision may be used to related such headings as
- Equivalent names in a multilingual thesaurus
- Example: Library and Archives Canada English heading
Francis, of Assisi, Saint, 1182-1226 and Library and Archives
Canada French heading
François, d'Assise, saint,
1182-1226
- Example: Library and Archives Canada English heading
Francis, of Assisi, Saint, 1182-1226 and Library and Archives
Canada French heading
François, d'Assise, saint,
1182-1226
- Equivalent topical term headings in different authority systems
- Example:Library of Congress Subject Headings (LCSH) headings
Medical referral and
Medical consultation and
Medical Subject Headings (MeSH) heading
Referral and Consultation
- Example:Library of Congress Subject Headings (LCSH) headings
Medical referral and
Medical consultation and
Medical Subject Headings (MeSH) heading
Referral and Consultation
- A topical term heading (field 150) and the same or similar term used as
a subject subdivision (field 78X)
- Example: established term History and the subject subdivision History
- Example: established term
Twentieth century and the subject subdivision
20th century
- A geographic name heading (field 151) and the indirect form of that name
used as a geographic subject subdivision (field 781)
- Example: established heading
Rome (N.Y.) and the subject subdivision
New York (State) -- Rome.
- Example: established heading
Rome (N.Y.) and the subject subdivision
New York (State) -- Rome.
- A genre/form term heading (field 155) and the same or similar term used
as a form subject subdivision (field 785)
- Example: established heading Periodicals and the subject subdivision Periodicals.
The 7XX field tag identifies whether the heading linking entry field contains an established heading (fields 700-755) or an authorized subdivision heading (fields 780-785). The second indicator or the subfield $2 identify the authority system to which the heading in field 7XX belongs. Subfield $0 (Record control number) contains the system control number of the related record when a separate MARC authority record exists for the 7XX heading.
A relationship that cannot be adequately expressed by the 700-785 linking entry fields is described textually in field 788.
A name portion containing open-ended date ends with a space when it is followed by other data in the same subfield; it does not end with a space when it is followed by another subfield.
Guidelines for the second indicator, subfield $2 (Source of heading or term), and subfield $w (Control subfield) in the 7XX fields are provided in this section. Guidelines for applying the other content designators defined for fields 700-785 are provided in each field's corresponding section.
Indicators
- First
The definition of the first indicator for each 7XX field is the same as in the corresponding 1XX (Heading) field. A description can be found with the corresponding 1XX field. - Second - Thesaurus
The thesaurus or authority file from which the heading came.- 0 - Library of Congress Subject
Headings/Name authority file
The subject added entry conforms to and is appropriate for use in the Library of Congress Subject Headings (LCSH) and/or the Name Authority Cooperative (NACO) file.
- 1 - LC subject headings for children's
literature
The subject added entry conforms to the "AC Subject Headings" section of the LCSH
- 2 - Medical Subject Headings/NLM
name authority file
The subject added entry conforms to Medical Subject Headings (MeSH) and/or the NLM name authority files.
- 3 - National Agricultural Library
subject authority file
The subject added entry conforms to the NAL subject authority file.
- 4 - Source not specified
The subject added entry conforms to a controlled list that cannot be identified by another defined value or by a code in subfield $2.
- 5 - Canadian Subject Headings/LAC
name authority file
The subject added entry conforms to and is appropriate for use in the Canadian Subject Headings and/or the Library and Archives Canada name authority file.
- 6 - Répertoire de vedettes-matière
The subject added entry conforms to and is appropriate for use in the Répertoire de vedettes-matière
- 7 - Source specified in subfield $2
- 0 - Library of Congress Subject
Headings/Name authority file
Special Subfield Codes
Subfields defined for the 7XX fields are generally the same as those for the corresponding 1XX fields, where some descriptions can be found. Descriptions of both subfield $w and subfield $2 defined for the 7XX fields are given in this section.- $w - Control subfield
(NR)
Up to two character positions (designated by $w/0 and $w/1) that control the generation of a link display or indicate the complexity of a heading in a 700-785 field. Subfield $w need be used only if the display is to be suppressed or the replacement of a heading should be reviewed.- /0 - Link display
A one-character alphabetic code that controls the suppression of a link display from a 700-785 field.- a - Link not displayed
- Used for local system-dependent reason for suppression that is not covered by code b or c. For interchange purposes, code a is converted to code n of a fill character (|).
- b - Link not displayed, field 788 used
- c - Link not displayed, non-7XX field used
- n - Not applicable
- Used when there is no restriction on displaying a link from the 7XX field. If code n is applicable, subfield $w/0 need not be used.
- /1 - Replacement complexity
A one-character alphabetic code that indicates the possibility of automatic replacement of a heading in a 700-785 field.- a - Heading replacement does not require review
- b - Heading replacement requires review
- n - Not applicable
- If code n is applicable, subfield $w/1 need not be used.
- /0 - Link display
- $2 - Source of heading or term
(NR)
A MARC code that identifies the source of the heading when the second indicator position contains value 7.
Code from: MARC Code Lists for Relators, Sources, Description Conventions
Examples
785 |
#7$vatlases$0[record control number]$2att |
750 |
#0$81$wb$aMedical referral |
700 |
11$wa$aDostoyevsky, Fyodor,$d1821-1881.$tCrime and punishment |
710 |
27$wa$aLast Poets$2[source code] |

