Some journals have ISSN number ending with X. What does it mean? Any insights?
An ISSN is composed of eight digits: the arabic numerals 0 to 9, except that in the case of the last digit, which is a check digit, the upper case X can appear. The purpose of the check digit is to guard against errors caused by the incorrect transcription of the ISSN. The method of determining the check digit for the ISSN is the modulus 11 basis, using the weighting factors 8 to 2. In the case of the ISSN, the Roman numeral X is used where the check digit calculation results in a remainder of 10.
The above is taken from Library of Congress
There is also a wikipedia page which can be referred for further info
http://www.loc.gov/issn/faq.html
http://en.wikipedia.org/wiki/International_Standard_Serial_Number
An ISSN is composed of eight digits: the arabic numerals 0 to 9, except that in the case of the last digit, which is a check digit, the upper case X can appear. The purpose of the check digit is to guard against errors caused by the incorrect transcription of the ISSN. The method of determining the check digit for the ISSN is the modulus 11 basis, using the weighting factors 8 to 2. In the case of the ISSN, the Roman numeral X is used where the check digit calculation results in a remainder of 10.
The above is taken from Library of Congress
There is also a wikipedia page which can be referred for further info
http://www.loc.gov/issn/faq.html
http://en.wikipedia.org/wiki/International_Standard_Serial_Number
The xISSN Web service supplies ISSNs and other information associated with serial publications represented in WorldCat. Submit an ISSN to this service, and it returns a list of related ISSNs and selected metadata. The service is based on WorldCat, the world's largest network of library content and services. The current xISSN database covers 742,395 ISSNs.
Ideal for Web-enabled search applications, such as library catalogs and OpenURL Resolvers, and based on associations made in the WorldCat database, xISSN enables an end user to link to information about alternate versions of serial publications.
http://xissn.worldcat.org/xissnadmin/index.htm
Dear @Rahul, it is about control digit! "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. The last code digit, which may be 0-9 or an X, is a check digit. The general form of the ISSN code can be expressed by a PCRE regular expression: \d{4}\-\d{3}[\dX]..." Link is given in Behrouz's attachment WIKI!
Unlike the ISBN, which contains country and publisher prefixes, the ISSN contains no inherent meaning.
Why Do Some ISSN End in an "X"? (taken from http://www.loc.gov/issn/faq.html)
"An ISSN is composed of eight digits: the arabic numerals 0 to 9, except that in the case of the last digit, which is a check digit, the upper case X can appear. The purpose of the check digit is to guard against errors caused by the incorrect transcription of the ISSN. The method of determining the check digit for the ISSN is the modulus 11 basis, using the weighting factors 8 to 2. In the case of the ISSN, the Roman numeral X is used where the check digit calculation results in a remainder of 10".
Ref. links:
1) http://www.loc.gov/issn/faq.html 2) http://www.bl.uk/bibliographic/issn.html
3) ISSN International Centre's home page: http://www.issn.org/
An ISSN is composed of eight digits: the arabic numerals 0 to 9, except that in the case of the last digit, which is a check digit, the upper case X can appear. The purpose of the check digit is to guard against errors caused by the incorrect transcription of the ISSN. The method of determining the check digit for the ISSN is the modulus 11 basis, using the weighting factors 8 to 2. In the case of the ISSN, the Roman numeral X is used where the check digit calculation results in a remainder of 10.
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