Heading Linking Entry Fields (7XX)
MARC 21 Authority - Concise
2007
This is an ARCHIVED VERSION of the
2007 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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