Authority 022 szerkesztése (szakasz)

== INPUT CONVENTIONS ==

:'''ISSN Structure''' - ISSN is an agency-assigned data element. ISSNs are assigned to continuing resource publications by national centers under the auspices of the ISSN Network. An ISSN consists of eight digits comprising two groups of four digits each, separated by a hyphen. The eighth 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). A description of the ISSN structure and the procedure for validation of the ISSN by calculating the check digit is in ''International Standard Serial Numbering (ISSN)'' (ISO 3297).

:'''Display Constants'''

::{|
|width='150px'|ISSN 	
|''[associated with the content of subfield $a]''
|-
|ISSN-L
|''[associated with the content of subfield $l]''
|-
|ISSN-L (canceled)
|''[associated with the content of subfield $m]''
|-
|ISSN (incorrect)
|''[associated with the content of subfield $y]''
|-
|ISSN (canceled)
|''[associated with the content of subfield $z]''
|}


:ISSN usually appears on an item with the prefix ISSN and as two groups of four digits separated by a hyphen. The hyphen separating the two groups of digits is carried in the MARC record. The initialisms ''ISSN'' and ''ISSN-L'' and the phrases ''ISSN-L (canceled)'', ''ISSN (incorrect)'' and ''ISSN (canceled)'' are not input. They may be system generated as display constants associated with the content of subfields $a, $l, $m, $y, and $z, respectively.
									
	
:::''Content designated field:''
::'''022''' 	##$a0046-225X$y0046-2254
	
:::''Display example:'' 
	
:::ISSN 0046-225X ISSN (incorrect) 0046-2254