Authority 020 szerkesztése

<p align="right">[[Kezdőlap]] - [[A MARC21 authority formátum]] - [[Authority 01X-09X]]</p>

{|align="right"
|__TOC__
|}

==First Indicator ==
:''Undefined''
:'#' - Undefined


== Second Indicator ==
:''Undefined''
:'#' - Undefined

	

== Subfield Codes ==

:$a - International Standard Book Number (NR)
:$c - Terms of availability (NR)
:$z - Canceled/invalid ISBN (R)
:$6 - Linkage (NR)
:$8 - Field link and sequence number (R)


== FIELD DEFINITION AND SCOPE ==


:International Standard Book Number (ISBN), terms of availability, and any canceled/invalid ISBN copied from field 020 of a MARC bibliographic record for a multipart item that is cataloged as a set.

:Inclusion of this field in the established heading record for a series provides a machine link within a system between the authority record for the series and a bibliographic record in which the heading is used as a series added entry. Each valid ISBN associated with the series is contained in a separate 020 field. The subfields in this field are defined for consistency with field 020 in the [http://www.loc.gov/marc/bibliographic/ecbdhome.html MARC 21 Format for Bibliographic Data].

:International Standard Serial Number (ISSN) associated with a heading for an issue of a serial for which series-type treatment is provided is contained in field 022 (International Standard Serial Number).


== GUIDELINES FOR APPLYING CONTENT DESIGNATORS ==

:'''INDICATORS'''

::Both indicators are undefined; each contains a blank (#).

:'''SUBFIELD CODES'''

::'''$a - International Standard Book Number'''
::Valid ISBN and any parenthetical qualifying information. ISBN and the embedded hyphens may be generated for display.
::Parenthetical qualifying information, such as the publisher/distributor, binding/format, and volume numbers, is not separately subfield coded.
									
:::'''020''' 	##$a0882335073 (set)
:::'''020''' 	##$a0882335065 (v. 2 : jacket)

::'''$c - Terms of availability'''
:::Price or a brief statement of availability and any parenthetical qualifying information concerning the terms.
:::When field 020 in the corresponding bibliographic record contains only a subfield $c, field 020 is not included in the authority record for the series.
									
::::'''020''' 	##$a8449955289 (v. 1)$c$15.00 (per vol.)

::'''$z - Canceled/invalid ISBN'''
:::Canceled or invalid ISBN and any parenthetical qualifying information. ISBN (invalid) and the embedded hyphens may be generated for display.
:::Each canceled/invalid ISBN is contained in a separate subfield $z.
									
::::'''020''' 	##$a0870686933 (v. 1 : alk. paper)$z0870684302 (jacket)

::'''$6 - Linkage'''
:::See description of this subfield in Appendix A: [http://www.loc.gov/marc/authority/ecadcntf.html Control Subfields].

::'''$8 - Field link and sequence number'''
See description of this subfield in Appendix A: [http://www.loc.gov/marc/authority/ecadcntf.html Control Subfields].


== INPUT CONVENTIONS ==

:'''ISBN Structure''' - ISBN is an agency-assigned data element. ISBNs are assigned to monographic publications by designated agencies in each country participating in the program. An ISBN consists of ten digits comprising four groups separated by hyphens. The tenth digit is a check digit used as a computer validity check; it consists of a number between 0 and 9 or an uppercase X (for the arabic numeral 10). Procedures for validation of the ISBN by calculating the check digit and hyphenating instructions are in ''Information and Documentation - International Standard Book Numbering'' (ISBN) (ISO 2108). A description of the ISBN structure and guidelines for recording qualifying information are found in ''Library of Congress Rule Interpretations'' available from the Cataloging Distribution Service, Library of Congress.

:'''Display Constants'''

::ISBN 	''[associated with the content of subfield $a]''
::ISBN (invalid) 	''[associated with the content of subfield $z]''
::- - - 	''[embedded hyphens]''

:ISBN is usually printed in a publication with the prefix ISBN and with each of its parts separated from the other by hyphens or spaces. The initialism ISBN, the phrase ISBN (invalid), and the embedded hyphens are not carried in the MARC record. They may be system generated as display constants associated with the content of subfields $a and $z, respectively.
									
	
:::''Content designated field:''
::'''020''' 	##$a0870686933 (v. 1)$z0870684302
	
:::''Display example:'' 
	
:::ISBN 0-87068-693-3 (v. 1) ISBN (invalid) 0-87068-430-2 


<p align="right">[[Kezdőlap]] - [[A MARC21 authority formátum]] - [[Authority 01X-09X]]</p>