MARC 21 Concise Classification: Control Subfields
This section contains descriptions of four subfields that are used to link field
data to specific institutions or to other fields. These subfields are defined
for several
($0 (Record control number) and $5 (Institution to which field applies)) or most
$6 (Linkage), and $8 (Field link and sequence number)) fields in the format,
thus their descriptions are brought
together in this section. The subfields are included in field level subfield
lists wherever they are
defined, with pointers to this section.
Information for Translators and Other Users
Items highlighted in red indicate changes made after
the 2004 edition of the MARC 21 Concise Formats was published and are
included
in the 2005 printed edition
of the MARC 21 Concise Formats.
Subfield $0 contains the system control number of the related classification record
preceded by the MARC code, enclosed in parentheses, for the system to which the control
number
applies.
See Organization Code Sources
for a listing of sources used in MARC 21 records.
084 |
0#$alcc |
153 |
##$aBS580.M6$hThe Bible$hGeneral$hWorks about the Bible$hMen, women and children of the Bible$hBiography$hIndividual Old Testament characters, A-Z$jMoses |
700 |
00$aMoses$c(Biblical leader)$0(DLC)n##79058331# |
084 |
0#$alcc |
153 |
##$aHG3881.5.I58$hFinance$hForeign exchange. International finance$hInternational finance.International monetary system. International banking$hIndividual international financial institutions, A-Z$jInternational Monetary Fund |
710 |
20$aInternational Monetary Fund$0(DLC)n##81052755# |
084 |
0#$alcc |
153 |
##$aPR1588$hEnglish literature$hAnglo-Saxon literature$hIndividual authors and works$hBeowulf$hCriticism$jLanguage, grammar, etc. |
730 |
00$aBeowulf$xLanguage$0(DLC)sh#85013267# |
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Subfield $5 contains the MARC code of the institution or organization to which a note
applies followed by any specific information about classification at the particular institution. It
is used for institution-specific information that may or may not apply to the universal use of the
classification record.
See Organization Code Sources
for a listing of sources used in MARC 21 records.
084 |
0#$aDDC$c21 |
153 |
##$a005.262$hGeneralities$hComputer programming, programs, data$kComputer programming and programs$hProgramming for specific types of computers, for specific operating systems, for specific user interfaces$hProgramming for digital microcomputers$jProgramming in specific programming languages |
683 |
1#$iArrange alphabetically by name of programming language, e.g., C++ |
683 |
1#$aUse first three letters of programming language to subarrange $5[location identifier] |
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Subfield $6 contains data that links fields that are different script representations of each
other. Subfield $6 may contain the tag number of an associated field, an occurrence number, a
code that identifies the first script encountered in a left-to-right scan of the field, and an
indication that the orientation for a display of the field data is right-to-left. A regular (non-880)
field may be linked to one or more 880 fields that all contain different script representations of
the same data. Subfield $6 is structured as follows:$6<linking tag>- <occurrence number> / <script identification code> / <field
orientation code>
Subfield $6 is always the first subfield in the field.
Descriptions of multiscript record models, with examples, are in the
Multiscript Records
section; specifications for field
880 are in the
Other Variable Fields
; specifications for character sets and repertoires for scripts are
found in
MARC 21 Specifications for Record Structure, Character Sets, and Exchange Media
.
Linking tag and occurrence number
The
Linking tag part contains the tag number of the associated field. This part is followed immediately by a hyphen and the two-digit
occurrence number part. A different occurrence number is
assigned to each set of associated fields within a single record. The function of an
occurrence number is to permit the matching of the associated
fields (not to sequence the fields within the record). An
occurrence number may be assigned at random for each set of
associated fields. An
occurrence number of less than two digits is right justified and
the unused position contains a zero.
When there is no associated field to which a field 880 is linked, the
occurrence number in subfield $6 is 00. It is used if an agency
wants to separate scripts in a record. The
linking tag part of subfield $6 will contain the tag that the
associated regular field would have had if it had existed in the record.
680 |
0#$6880-02$iClass here editions first edited in the 20th century. |
880 |
##$6680-02/N$i[Explanatory text in Cyrillic script] |
Script identification code
The occurrence number is followed immediately by a slash (/) and the
script identification code. This code identifies the alternate
script found in the field. The following codes are used:
Code |
|
Script |
(3 |
|
Arabic |
(B |
|
Latin |
$1 |
|
Chinese, Japanese, Korean |
(N |
|
Cyrillic |
(2 |
|
Hebrew |
(S |
|
Greek |
880 |
1#$6153-01/(2/r$j[Caption in Hebrew script] |
The entire field need not be in the script identified in subfield $6. If
more than one script is present in the field, subfield $6 will contain the identification of the
first alternate script encountered in a left-to-right scan of the
field.
Note also that the
script identification code is used in field 880, subfield $6, but
this data element is not generally used for subfield $6 of the associated regular field. In the
associated field, the data is assumed to be the primary script(s) for the
record.
Orientation code
In a MARC record, the contents of field 880 are always recorded in their logical
order, from the first character to the last, regardless of field orientation. For a display of the
field, the default field orientation is left-to-right. When the field contains text that has a
right-to-left orientation, the
script identification code is followed by a slash (/) and the field
orientation code. The MARC field
orientation code for right-to-left scripts is the letter r. The
orientation code is only included in fields with right-to-left
orientation, since left-to-right orientation is the default orientation in 880 fields. (See
MARC 21 Specifications for Record Structure, Character Sets, and Exchange Media
for a detailed description
of field orientation.)
880 |
##$6680-00/(2/r$a[Scope note in Hebrew script] |
Note that the
orientation code is used in field 880, subfield $6, but this data
element is not generally used for subfield $6 of the associated regular field. In the associated
field, the data is assumed to be the usual orientation of the primary script(s) for the
record.
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Subfield $8 contains data that identifies linked fields and may also propose a sequence for
the linked fields. Subfield $8 may be repeated to link a field to more than one other group of
fields. The structure and syntax for the field link and sequence number subfield
is:<linking number>.<sequence number> \ <field link type>
Linking number
This is the first data element in the subfield and required if the subfield is used. It is a
variable-length whole number that occurs in subfield $8 in all fields that are to be linked. Fields
with the same linking number are considered linked.
Sequence number
This number is separated from linking number by a period "." and is optional.
It is a variable-length whole number that may be used to indicate the relative order for display
of the linked fields (lower sequence numbers displaying before higher ones). If it is used it must
occur in all $8 subfields containing the same linking number.
Field link type
This code is separated from preceding data by a reverse slash. It is a code
indicating the reason for the link and it follows the link number, or sequence number if present.
In the absence of a field link type, it is assumed that subfield $8 is used for linking and
sequencing related 6XX (Notes) or 76X (number building instructions and subarrangements)
fields. The use of subfield $8 to maintain the order of these fields is essential to the
understanding and application of the subarrangement or table. No explicit field link types have
been defined in the MARC 21 Format for Classification Data.
084 |
0#$alcc |
153 |
##$aHE394.A$cHE394.Z$hTransportation and communications$hWater transportation$hWaterways$hBy region or country$hUnited States$jRiver improvement. By name of river, A-Z |
763 |
08$iUnder each: |
763 |
10$81.1$a.x$jPeriodicals. Series$p153 |
763 |
10$81.2$a.x3$jGeneral works$p153 |
763 |
10$81.3$a.x4$jGeneral special$p153 |
Subfield $8 is always the first subfield in the field.Go to top of document
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