Overview

An ISSN symbol is an EAN-13 with prefix 977 used to identify periodicals.

Invoking

• The data should contain the 7 or 8 digits ISSN separated by a dash characters -, followed by a two digit sequence variant, optionally followed by a two digit addon for the issue number.
• If the last digit of the ISSN data is not given then the ISSN checkdigit is calculated automatically.
• The includetext option should normally be supplied.
• The guardwhitespace option enables the display of whitespace guard marks.
• The following options are also relevant to this symbology:
• issnfont: Font name for text above symbol
• issnsize: Font size for the text above symbol, in points
• issnpos: Position of text above symbol relative to height, in points

Example ISSN

Identical symbols, input provided with and without an ISSN check digit and having sequence number 00:

0 0 moveto (0317-8471 00) (includetext guardwhitespace) /issn /uk.co.terryburton.bwipp findresource exec

0 0 moveto (0317-847 00) (includetext guardwhitespace) /issn /uk.co.terryburton.bwipp findresource exec

An ISSN with sequence number 03 and a 2 digit addon representing issue number 17:

0 0 moveto (0317-8471 03 17) (includetext guardwhitespace) /issn /uk.co.terryburton.bwipp findresource exec

0 0 moveto (0317-847 03 17) (includetext guardwhitespace) /issn /uk.co.terryburton.bwipp findresource exec