| First Indicator | Second Indicator |
|---|---|
| Level of international interest # - No level specified 0 - Continuing resource of international interest 1 - Continuing resource not of international interest |
Undefined # - Undefined |
| Subfield Codes | |
|---|---|
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International Standard Serial Number (ISSN), a unique identification number assigned to a continuing resource, and/or any incorrect or canceled ISSN.
First Indicator - Level of international interest
Value that specifies whether the continuing resource is of international interest or of local or ephemeral interest only.
Level of international interest is unknown or not specified. Used by all institutions other than the ISSN Centers when recording the ISSN from an issue or from a bibliography.
Of international interest, thus a full record has been registered with the ISSN Network. Used for all continuing resources for which individual ISSN Centers receive ISSN requests from abstracting and indexing services or other ISSN Network centers. Also used for all other continuing resources that are not within the scope defined for value 1. This value may be input only by the ISSN Centers.
Not of international interest, thus an abbreviated record has been registered with the ISSN Network. Used for continuing resources judged to be of local or ephemeral interest. ISSN Centers have defined publications of local or ephemeral interest as those in which interest is likely to be limited to a certain geographic area, e.g., local newspapers, or certain span of time, e.g., calendars of events. In case of doubt, value 0 is used. This value may only be input by the ISSN Centers.
Second Indicator - Undefined
Undefined and contains a blank (#).
$a - International Standard Serial Number
Valid ISSN for the continuing resource. ISSN may be generated for display.
| 022 | ##$a0376-4583 | ||||||||
$y - Incorrect ISSN
Incorrect ISSN that has been associated with the continuing resource. Each incorrect ISSN is contained in a separate subfield $y. A canceled ISSN is contained in subfield $z.
ISSN (incorrect) may be generated for display.
| 022 | 0#$a0046-225X$y0046-2254 | ||||||||
$z - Canceled ISSN
Canceled ISSN that is associated with the continuing resource. Each canceled ISSN is contained in a separate subfield $z.
ISSN (canceled) may be generated for display.
| 022 | 0#$a0145-0808$z0361-7106 | ||||||||
| 022 | 0#$z0027-3473 | ||||||||
$0 - Authority record control number or standard number
A URI for the ISSN in subfield $a.
See description of this subfield in Appendix A: Control Subfields.
| 022 | 0#$a1534-9322$0http://issn.org/resource/ISSN/1534-9322#ISSN | ||||||||
$1 - Real World Object URI
See description of this subfield in Appendix A: Control Subfields.
$2 - Source
ISSN Center responsible for assigning and maintaining ISSNs and related data.
Code from: ISSN Manual, Annex 3: List of ISSN Centre codes [PDF, 199 KB].
$6 - Linkage
See description of this subfield in Appendix A: Control Subfields.
$8 - Field link and sequence number
See description of this subfield in Appendix A: Control Subfields.
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).
Punctuation - Field 022 does not end with a period.
Display Constants
| ISSN | [associated with the content of subfield $a] |
| 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 initialism ISSN and the phrases ISSN (incorrect) and ISSN (canceled) are not input. They may be system generated as display constants associated with the content of subfields $a, $y, and $z, respectively.
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Content designated field:
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| 022 | 0#$a0018-5817$y0018-5811 | ||||||||
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Display example: ISSN 0018-5817 ISSN (incorrect)
0018-5811
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Subfield $l was made obsolete in favor of recording ISSN-L in field 023.
Subfield $m was made obsolete in favor of recording canceled ISSN-L in field 023.
Subfield $z was redefined to include only ISSN assignment cancellations when subfield $y was defined. Prior to that time, subfield $z contained both incorrect and canceled ISSNs.