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An International Standard Serial Number (ISSN) is an eight-digit serial number used to uniquely identify a serial publication. The ISSN is especially helpful in distinguishing between serials with the same title. ISSN are used in ordering, cataloging, interlibrary loans, and other practices in connection with serial literature.〔(【引用サイトリンク】title=Collection Metadata Standards )〕 The ISSN system was first drafted as an International Organization for Standardization (ISO) international standard in 1971 and published as ISO 3297 in 1975. ISO subcommittee TC 46/SC 9 is responsible for maintaining the standard. When a serial with the same content is published in more than one media type, a different ISSN is assigned to each media type. For example, many serials are published both in print and electronic media. The ISSN system refers to these types as print ISSN (p-ISSN) and electronic ISSN (e-ISSN), respectively. Conversely, as defined in ISO 3297:2007, every serial in the ISSN system is also assigned a linking ISSN (ISSN-L), typically the same as the ISSN assigned to the serial in its first published medium, which links together all ISSNs assigned to the serial in every medium.〔 HTML version available at http://www.issn.org/understanding-the-issn/assignment-rules/issn-manual.〕 ==Code format== The format of the ISSN is an eight digit code, divided by a hyphen into two four-digit numbers.〔 As an integer number, it can be represented by the first seven digits.〔(Example of database implementation ) where seven-digit integers are used to store ISSNs.〕 The last code digit, which may be 0-9 or an X, is a check digit. Formally, the general form of the ISSN code (also named "ISSN structure" or "ISSN syntax") can be expressed as follows:〔https://tools.ietf.org/html/rfc3044〕 : : where N is in the set , a digit character, and C is in ;or by a PCRE regular expression:〔See p. ex. $pattern at source code (issn-resolver.php) of (github.com/amsl-project/issn-resolver ).〕 : . The ISSN of the journal ''Hearing Research'', for example, is 0378-5955, where the final 5 is the check digit, that is C=5. To calculate the check digit, the following algorithm may be used: :Calculate the sum of the first seven digits of the ISSN multiplied by its position in the number, counting from the right—that is, 8, 7, 6, 5, 4, 3, and 2, respectively: :: :: :: :The modulus 11 of this sum is then calculated; divide the sum by 11 and determine the remainder: :: :If there is no remainder the check digit is 0, otherwise the remainder value is subtracted from 11 to give the check digit: :: :5 is the check digit, C.:For calculations, an upper case X in the check digit position indicates a check digit of 10 (like a Roman ten). To confirm the check digit, calculate the sum of all eight digits of the ISSN multiplied by its position in the number, counting from the right (if the check digit is X, then add 10 to the sum). The modulus 11 of the sum must be 0. There is an online ISSN checker that can validate an ISSN, based on the above algorithm.〔(【引用サイトリンク】title=Online ISSN Checker )〕〔(【引用サイトリンク】title=Online ISSN Validator )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「International Standard Serial Number」の詳細全文を読む スポンサード リンク
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