Heading Linking Entry Fields (7XX)
MARC 21 Authority - Concise
2008
This is an ARCHIVED VERSION of the
2008 electronic edition of the MARC 21 Concise
Formats. Please see loc.gov/marc/concise/
for the most up-to-date version of the electronic MARC 21
Concise Formats.
The 7XX Heading Linking Entry fields provide 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.
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)
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 relate
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
- 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
- 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 HistoryExample:
established term Twentieth century and the subject
subdivision 20th century
- 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.
- 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.
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.
Guidelines for the second indicator, subfield $2 (Source of
heading or term), and subfield $w (Control subfield) in the 7XX
fields, as well as special instructions for field 788 are
provided in this section. Guidelines for applying the other
content designators defined for fields 700-785 are provided in
the General Information sections for each
corresponding field.
Indicators
First
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
Name and/or subject heading system or thesaurus used in
constructing the heading.
0 - Library of Congress Subject Headings/Name authority file
Heading conforms to and is appropriate for use in the
Library of Congress Subject Headings (LCSH) and/or
the Name Authority Cooperative (NACO) file that are both
cooperatively maintained at the Library of Congress.
1 - LC subject headings for children's literature
Heading conforms to the "AC Subject Headings" section of
the LCSH.
2 - Medical Subject Headings/NLM name authority file
Heading conforms to Medical Subject Headings
(MeSH) and/or the National Library of Medicine name
authority files.
3 - National Agricultural Library subject authority file
Heading conforms to the U.S. National Agricultural Library
subject authority file.
4 - Source not specified
Heading conforms to a controlled list that cannot be
specified by another second indicator value or by an
identifying MARC code in subfield $2.
5 - Canadian Subject Headings/LAC name authority file
Heading 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
Heading conforms to and is appropriate for use in the
Répertoire de vedettes-matière that is maintained
by the Bibliothèque de l'Université de Laval.
7 - Source specified in subfield $2
Special Subfield Codes
Subfields defined for the 7XX fields are generally the same
as those for the corresponding 1XX
field, where some descriptions can be found. Descriptions
of both subfield $wand 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 or $w/1)
that control the generation of a link display or indicate
the complexity of a heading in a 700-785 field. Used only
if the display is to be suppressed or the replacement of a
heading should be reviewed.
/0 - Link display
One-character alphabetic code that controls the
suppression of a link display from a 700-785 field.
a - Link not displayedUsed for a 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 or a fill character (|).
b - Link not displayed, field 788 usedGeneration of a
link display from a 700-785 field is suppressed because
of the existence of field 788 (Complex Linking Entry
Data) in the record.
c - Link not displayed, non-7XX field usedGeneration of a
link display from a 700-785 field is suppressed because a
non-7XX field (e.g., 360, 680) in the record describes
the relationship.
n - Not applicableUsed 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
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 applicableHeading is not being replaced by
another heading. If code n is applicable, $w/1 need not
be used.
$2 - Source of heading or term (NR)
Examples
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710 |
27$wa$aLast Poets
$2[source code] |
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750 |
#0$81$wb
$aMedical referral |
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785 |
#7$vatlases $0 [record
control number] $2aat |
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