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Perl extension for International Standard Serial Numbers

* new($issn)

  The constructor accepts a scalar representing the ISSN.

  The string representing the ISSN may contain characters other than
  [0-9xX], although these will be removed in the internal representation.
  The resulting string must look like an ISSN - the first seven characters
  must be digits and the eighth character must be a digit, 'x', or 'X'.

  The string passed as the ISSN need not be a valid ISSN as long as it
  superficially looks like one. This allows one to use the 'fix_checksum'
  method.

  One should check the validity of the ISSN with 'is_valid()' rather than
  relying on the return value of the constructor.

  If all one wants to do is check the validity of an ISSN, one can skip the
  object-oriented interface and use the c<is_valid_checksum()> function
  which is exportable on demand.

Source Files

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