International Standard Serial Number

From New World Encyclopedia

An International Standard Serial Number (ISSN) is a unique eight-digit number used to identify a print or electronic periodical publication. The ISSN system was adopted as international standard ISO 3297 in 1975. The ISO subcommittee TC 46/SC 9 is responsible for the standard.

Code format

The format of the ISSN is an eight digit number, divided by a hyphen into two four-digit numbers. The last digit, which may be 0–9 or an X, is a check digit.

A "check digit" is a form of redundancy check used for error detection, the decimal equivalent of a binary checksum. It consists of a single digit computed from the other digits in the message. With a check digit, one can detect simple errors in the input of a series of digits, such as a single mistyped digit, or the permutation of two successive digits.

The ISSN of the journal Hearing Research, for example, is 0378-5955. To confirm the check digit, the following algorithm may be used:

Calculate the sum of the first seven digits of above ISSN multiplied by 8, 7, 6, 5, 4, 3, and 2, respectively:

0*8 + 3*7 + 7*6 + 8*5 + 5*4 + 9*3 + 5*2
= 0 + 21 + 42 + 40 + 20 + 27 + 10
= 160.

The modulus 11 of this sum is then calculated. Some calculators have a mod() function:

160 mod 11 = 6.

Alternatively you can divide the sum by 11 and determine the remainder:

160/11 = 14 remainder 6.

This modulus or remainder value is then subtracted from 11 to give the check digit:

11 - 6 = 5
5 is the check digit.

An upper case X in the check digit position indicates a check digit of 10.

Code assignment

ISSN codes are assigned by a network of ISSN National Centres, usually located at national libraries and coordinated by the ISSN International Centre based in Paris. The International Centre is an intergovernmental organization created in 1974 through an agreement between UNESCO and the French government. The International Centre maintains a database of all ISSNs assigned worldwide, the ISDS Register (International Serials Data System) otherwise known as the ISSN Register. The ISSN Register contains ISSN codes and descriptions for more than one million periodicals[1] with around 50,000 new records added yearly.

Comparison to other identifiers

ISSN and ISBN codes are similar in concept, where ISBNs are assigned to individual books. For particular issues of a periodical an ISBN might be assigned in addition to the ISSN code for the periodical as a whole. Unlike the ISBN code, an ISSN is an anonymous identifier associated with a periodical title, containing no information as to the publisher or its location. For this reason, a new ISSN is assigned to a periodical each time it undergoes a major title change.

Since the ISSN applies to an entire periodical, a new identifier, the Serial Item and Contribution Identifier (see below), was built on top of it, to allow referencing specific volumes, articles, or other identifiable components.

Availability

The ISSN Register is not freely available for interrogation on the web but is available on a subscription basis. There are several routes to the identification and verification of ISSN codes for the general public.

  • the print version of a periodical typically will include the ISSN code as part of the publication information
  • most, though not all, periodical websites contain ISSN code information
  • derivative lists of publications will often contain ISSN codes; these can be found through on-line searches with the ISSN code itself or periodical title

Use in URNs

An ISSN can be encoded as a URN by prefixing it with "urn:issn:".[2] For example Rail could be referred to as "urn:issn:1534-0481." If the checksum digit is "X" then it is always encoded in uppercase in a URN.

Serial Item and Contribution Identifier

The Serial Item and Contribution Identifier (SICI) is a code (ANSI/NISO standard Z39.56) used to uniquely identify specific volumes, articles or other identifiable parts of a periodical. It is “intended primarily for use by those members of the bibliographic community involved in the use or management of serial titles and their contributions”.

Description

It is an extension of the International Standard Serial Number, which identifies an entire periodical (similar to the way an ISBN number identifies a specific book). The ISSN applies to the entire publication, however, including every volume ever printed, so this more specific identifier was developed by the Serials Industry Systems Advisory Committee (SISAC) to allow references to specific parts of a journal.

The variable-length code is compatible with other identifiers, such as DOI, PII, and URN.[3][4] It is free of charge.

The SICI is a recognized international standard and is in wide use by publishers and the bibliographic community, primarily as an aid to finding existing articles or issues.[5] JSTOR adopted SICIs in 2001 as the primary article identifier, due to their persistence and applicability to the many types of journal content found in JSTOR's archive.[6][7]

Details

The SICI code is composed of three segments, intended to be both human-readable and easy for machines to parse automatically. The following example SICI is explained below[8]:

Item
Abstract from Lynch, Clifford A. “The Integrity of Digital Information; Mechanics and Definitional Issues.” JASIS 45:10 (Dec. 1994) p. 737-44
SICI
0002-8231(199412)45:10<737:TIODIM>2.3.TX;2-M

Item segment

0002-8231
This is the ISSN for the periodical, in this case the Journal of the American Society for Information Science
(199412)
The chronology part is in parentheses and identifies the date of publication. In this case, it is signified by month and year; December 1994
45:10
The enumeration part signifies the volume and number; Vol. 45, no. 10.

Contribution segment

<
Signifies the start of the contribution segment
737
Location code: signifies the page number, frame number, reel number, etc. In this case, page 737
TIODIM
Title code: based on the title of the article. In this case, an initialism: “The Integrity of Digital Information; Mechanics and Definitional Issues”.
>
Signifies the end of the contribution segment

Control segment

2
Code Structure Identifier (CSI) for the type of SICI being constructed
3
Derivative Part Identifier (DPI) identifies a part of the contribution, such as a table of contents or abstract
TX
Format identifier two-letter code signifying the way content is presented. In this case, TX = printed text
2-
Standard version number
M
Check character allows a computer to detect errors in the code, similar to ISBN's check digit

See also

  • CODEN
  • Serial Item and Contribution Identifier

References
ISBN links support NWE through referral fees

External links

be-x-old:ISSN

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