7XX - Heading Linking Entries-General Information
MARC 21 Authority
October 2002
"Full" documentation refers to the MARC 21 Format for Authority Data that contains detailed descriptions of every data element, along with examples, input conventions and history sections.
"Concise" documentation refers to the MARC 21 Concise Format for Authority Data that contains abridged descriptions of every data element, along with examples.
700 - Established Heading Linking Entry - Personal Name (R)
Full |
Concise
710 - Established Heading Linking Entry - Corporate Name (R)
Full |
Concise
711 - Established Heading Linking Entry - Meeting Name (R)
Full |
Concise
730 - Established Heading Linking Entry - Uniform Title (R)
Full |
Concise
748 - Established Heading Linking Entry - Chronological Term (R)
Full |
Concise
750 - Established Heading Linking Entry - Topical Term (R)
Full |
Concise
751 - Established Heading Linking Entry - Geographic Name (R)
Full |
Concise
755 - Established Heading Linking Entry - Genre/Form Term (R)
Full |
Concise
780 - Subdivision Linking Entry - General Subdivision (R)
Full |
Concise
781 - Subdivision Linking Entry - Geographic Subdivision (R)
Full |
Concise
782 - Subdivision Linking Entry - Chronological Subdivision (R)
Full |
Concise
785 - Subdivision Linking Entry - Form Subdivision (R)
Full |
Concise
DEFINITION AND SCOPE
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. 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 History
Example: 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 APPLYING CONTENT DESIGNATORS
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.
First indicator position and all of the subfield codes defined for field 788 (Complex
Linking Entry Data) are described in the description of that field. The second indicator
position is described in this section.
■ INDICATOR
Second Indicator - 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 Heading conforms to a controlled list other than that specified by one of the
other defined values and for which an identifying MARC code is contained in
subfield $2.
■ SUBFIELD CODES
$w - Control subfield 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.
Because the definitions of the codes in subfield $w are dependent on
the character position in which they occur, the coding of any character position
mandates that each preceding character position contains a code or a fill
character (|); succeeding character positions need not be used.
/0 - Link display One-character alphabetic code that controls the suppression of a link display
from a 700-785 field.
a - Link not displayed Used for a local system-dependent reason for suppression that is not covered
by code b or c. For interchange purposes, code a is converted to code n or a
fill character (|).
|
|
|
|
|
|
|
|
|
|
| 008/09 |
a
[established heading record] |
| 008/11 |
a
[code indicating LCSH] |
| 110 |
2#$aLast Poets (Group) |
| 710 |
27$wa$aLast Poets$2 [source code]
[Record for the linking entry form of the name is not in LC system.]
|
b - Link not displayed, field 788 used Generation of a link display from a 700-785 field is suppressed because of
the existence of field 788 (Complex Linking Entry Data) in the record.
|
|
|
|
|
|
|
|
|
|
| 008/09 |
a
[established heading record] |
| 008/11 |
c
[code indicating MeSH] |
| 150 |
##$aReferral and Consultation |
| 750 |
#0$81$wb$aMedical referral |
| 750 |
#0$81$wb$aMedical consultation
[The two LCSH headings are the equivalent of the MeSH heading.]
|
c - Link not displayed, non-7XX field used Generation of a link display from a 700-785 field is suppressed because a
non-7XX field (e.g., 360, 680) in the record describes the relationship.
|
|
|
|
|
|
|
|
|
|
| 008/09 |
a
[established heading record] |
| 008/11 |
a
[code indicating LCSH] |
| 150 |
##$aCorrosion and anti-corrosives |
| 360 |
##$isubdivision$aCorrosion$iunder individual materials, metals and metal
compounds and types of engineering structures, equipment, and
vehicles. e.g.$aConcrete-Corrosion; Copper-Corrosion; Automobile
-Corrosion
|
| 780 |
#0$wc$xCorrosion |
n - Not applicable Used when there is no restriction on displaying a link from the 7XX field.
If code n is applicable, subfield $w/0 need not be used.
/1 - Replacement complexity One-character alphabetic code that indicates the possibility of automatic
replacement of a heading in a 700-785 field.
a - Heading replacement does not require review Headings that are always used to replace the obsolete heading (i.e.,
headings that can be machine substituted without requiring manual review).
|
|
|
|
|
|
|
|
|
|
| 040 |
##$aDLC$dOCLC$ffast |
| 150 |
##$aSummer resorts |
| 550 |
##$aResorts |
| 550 |
##$aSeaside resorts |
| 750 |
#0$aSummer resorts$0(DLC)sh#85130430#$wna |
b - Heading replacement requires review Heading may be used as a replacement, but requires subject analysis to
determine its appropriateness (i.e., headings that should be used as
replacements only after manual review).
|
|
|
|
|
|
|
|
|
|
| 040 |
##$aDLC$dOCLC$ffast |
| 151 |
##$aMichigan$zCharlevoix |
| 751 |
#0$aCharlevoix (Mich.)$0(DLC)n##82062705#$wnb |
n - Not applicable Heading is not being replaced by another heading. If code n is applicable,
$w/1 need not be used.
$2 - Source of heading or term
|
|
|
|
|
|
|
|
|
|
| 008/09 |
d
[subdivision record] |
| 008/11 |
r
[code indicating AAT] |
| 185 |
##$vatlases |
| 755 |
#7$vatlases$0 [record control number] $2aat |
|
|
|
|
|
|
|
|
|
|
| 008/09 |
a
[established heading record] |
| 008/11 |
r
[code indicating AAT] |
| 155 |
##$aatlases |
| 785 |
#7$vatlases$0 [record control number] $2aat
[The same heading is used both as a subject and as a subdivision term in the
Art & Architecture Thesaurus] |
INPUT CONVENTIONS
General Input Conventions - General input conventions for the 7XX fields are provided in the General
Information sections for each type of heading (X00 Personal Names; X10 Corporate
Names; X11 Meeting Names; X30 Uniform Titles; X48 Chronological Terms, X50 Topical
Terms; X51 Geographic Names; X55 Genre/Form Terms; X80 General Subdivisions; X81
Geographic Subdivisions; X82 Chronological Subdivisions, X85 Form Subdivisions).
Order of Subfields - Subfields $6 and $5, when they are used, are the first and last
subfields, respectively, in a field. When these and other control and linking subfields
are used in a 7XX linking entry field, they occur in the following order.
$6 $8 $w <heading subfields: $a,
etc.> $0 $2 $5
Display Constants for Linking Entries - In the 7XX linking entry fields, phrases such as those listed below are not carried in
the MARC record. They may be system generated as display constants associated with the
field tag.
- Related heading: Related subdivision:
- Equivalent heading: Equivalent subdivision:
When the 1XX and 7XX headings are from different systems or thesauri, a display constant
may be a combination of a tag-related phrase like one of the above and either coded or
textual data generated by the value in the second indicator position (Subject heading
system/thesaurus) or the source code in subfield $2 (Source of heading or
term).
For field 788, the complete display constant may be a combination of a tag-related
phrase and explicit text contained in subfield $i (Explanatory text).
CONTENT DESIGNATOR HISTORY
Field 748 - Established heading linking entry-Chronological term [NEW, 2002]
Field 9XX - Equivalent Headings [OBSOLETE, 1997] [CAN/MARC only]
$v - Form subdivision [REDEFINED, 1995] [USMARC only]
$u - Record control number [OBSOLETE, 1997] [USMARC only]
$0 - Record control number [NEW, 1997]
$w/1 - Replacement complexity [NEW, 2002]