Descriptions of four subfields that are used to link field
data to specific institutions or to other fields. These
subfields are defined for several ($5 (Institution to which
field applies)) or most ($6 (Linkage), $8 (Field link and
sequence number)) fields in the format, thus their descriptions
are brought together in this appendix. The subfields are
included in field level subfield lists wherever they are
defined, with pointers to this appendix.
$6 - Linkage
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.
Linking tag and occurrence number.
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.
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| 680 |
0#$6880-02$iClass here editions first edited in the
20th century. |
| 880 |
##$6680-02/N$i[Explanatory text in Russian] |
Script identification code. 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:
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Code |
Script |
| (3 |
Arabic |
| (B |
Latin |
| $1 |
Chinese, Japanese,
Korean |
| (N |
Cyrillic |
| (S |
Greek |
| (2 |
Hebrew |
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| 880 |
1#$6153-01/(2/r$j[Caption in Hebrew script] |
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.)
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| 880 |
##$6680-00(2/r$a[Scope note in Hebrew script]
[The r indicates the right-to-left orientation of
the 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.
$8 - Field Link and Sequence Number
Data that identifies linked fields and may 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 number 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 the 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 number 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 $8 to maintain the order of these fields is
essential to the understanding and application of the
subarrangement or table. No explicit field link types have
been defined in the MARC 21 Format for Classification
Data.
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| 084 |
0#$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$jPeriodicals. Serials$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.
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