MARC 21 Format for Classification Data: 353: Complex See Also Reference (Network Development and MARC Standards Office, Library of Congress)

Explanatory text and the classification number referred to that are required when see also relationships exist between classification numbers that cannot be adequately conveyed by one or more simple cross references generated from field 553 (Valid Number Tracing).

This field guides the user to related topics classed in other valid classification numbers. A Complex See Also Reference is appropriate only in valid or partially valid classification number records (as indicated in 008/08 (Classification validity), code a, b, or c).

A cross reference display may be constructed from the 153 and 353 fields of the record. Field 153 (Classification Number) contains the classification number or span referred from and field 353 contains the classification number or span referred to. When several reference notes are associated with a classification number, each note may be recorded in a separate field or they may be combined and recorded in a single field.

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

■ INDICATORS

■ SUBFIELD CODES

$a - Classification number referred to-single number or beginning number of span

Single classification number or the beginning number of a classification number span to which reference is made from the classification number(s) in field 153 of the record.


084	0#$addc$c22 [Dewey Decimal Classification]
153	##$a384.6025$hSocial sciences$hCommerce, communications, transportation$kCommunications and transportation$hCommunications. Telecommunication$kTelecommunication$hTelephony$jDirectories of persons and organizations
353	##$a914$c919, $iplus notation$a0025$ifrom table under$a913$c919, $ifor telephone directories, e.g., New York City telephone directory$a917.4710025


084	0#$alcc [Library of Congress Classification]
153	##$aF2423$hLatin America. Spanish America$hSouth America$hGuiana$hSurinam. Netherlands or Dutch Guiana$hHistory$hBy period$j1604-1814
353	##$iCf.$aF2381 $cF2383$iEssequibo, Dememrara, and Berbice (Former Dutch colonies) [The reference is for a number span that cannot exist as a separate record because it encompasses several hierarchies.]

$c - Classification number referred to-ending number of span

Element of the ending number of a classification number span to which reference is made from the classification number(s) in field 153 of the record. The element may consist of the whole classification number or a part of the classification number.


084	0#$alcc [Library of Congress Classification]
153	##$zL5$a19.8$hTables of subdivisions: Institutions in America (LD-LE)$hHistory and description$jDormitories, residence halls, etc.
353	##$iCf.$aNA6600+, $iArchitecture [The reference is for a number span that cannot exist as a separate record because it encompasses several hierarchies.]

$i - Explanatory text

Explanatory text of the see also reference. The text may be broken up by subfield $a or $c data and may be only a connector term, such as e.g. or and.


084	0#$alcc [Library of Congress Classification]
153	##$aHF5030$cHF5335.22$hCommerce$hBusiness$jDirectories
353	##$iCf. classes D, E, F, Local residence directories which include business directories

$y - Table sequence number for internal subarrangement or add table

Sequence number or other identifier for an internal classification subarrangement or add table. If the first or only add table found at a classification number is the number 1, succeeding integers are used for any following add tables found at that number.

$z - Table identification

Identification of the table to which a classification number recorded in field 353 belongs, if the classification number is part of a table. The identification of the table by which a classification number or span is further sub-arranged is contained in field 762 (Table Identification). For a classification number span, subfield $z is given only once, before the first number. Subfield $z is input before the first element of the classification number in the first subfield $a.


084	0#$alcc [Library of Congress Classification]
153	##$zZ1$a13.C78$hNational bibliography. Imprints$hLiterature (General)$hSpecial topics, A-Z$jComparative literature
353	##$iCf.$aZ6514.C7, $iComparative literature (General) [Reference is from a table number to a schedule number.]

$6 - Linkage

See the description of this subfield in Appendix A: Control Subfields.

$8 - Field link and sequence number

See the description of this subfield in Appendix A: Control Subfields.

INPUT CONVENTIONS

Display constants - Display constants for a reference instruction phrase may be system generated on the basis of the field tag. However, because several types of standard wording may be used for see references, it may not be desirable to use display constants. In cases where display constants are not used, all terms to be displayed are recorded explicitly in field 353 subfield $i (Explanatory text).

SCHEME-SPECIFIC CONVENTIONS

Library of Congress Classification - For LCC, field 353 is used for the following situations:

If more than three numbers are referred to, which would require more than three tracings in three separate records
If a synthesized number is referred to and it is not desirable to create a separate record for it
If a span of numbers or whole subclasses are referred to for which no separate classification record exists
For a general reference note that does not contain a specific classification number or that includes a specific number or numbers only as illustrative examples.

Dewey Decimal Classification - This field is not likely to be used frequently in the Dewey Decimal Classification except when it is desirable to provide both complex reference fields (253, 353) and tracing fields (453, 553). Since the majority of see also references can be accommodated in a simple see also tracing field (353), the example shown is only intended to illustrate the coding of data elements, not to show instances of actual use.

353 - Complex See Also Reference (R)

FIELD DEFINITION AND SCOPE

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

■ INDICATORS

■ SUBFIELD CODES

INPUT CONVENTIONS

SCHEME-SPECIFIC CONVENTIONS

CONTENT DESIGNATOR HISTORY


Subfield Codes
$a - Classification number referred to-single number or beginning number of span (R) $c - Classification number referred to-ending number of span (R) $i - Explanatory text (R)	$y - Table sequence number for internal subarrangement or add table (R) $z - Table identification (R) $6 - Linkage (NR) $8 - Field link and sequence number (R)