Authority 020 szerkesztése (szakasz)

== 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>