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| -rw-r--r-- | doc/src/sgml/isn.sgml | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/doc/src/sgml/isn.sgml b/doc/src/sgml/isn.sgml index d1d98fe1b8d..3735988db1b 100644 --- a/doc/src/sgml/isn.sgml +++ b/doc/src/sgml/isn.sgml @@ -10,8 +10,15 @@ <para> The <filename>isn</filename> module provides data types for the following international product numbering standards: EAN13, UPC, ISBN (books), ISMN - (music), and ISSN (serials). Numbers are validated on input, and correctly - hyphenated on output. + (music), and ISSN (serials). Numbers are validated on input according to a + hard-coded list of prefixes; this list of prefixes is also used to hyphenate + numbers on output. Since new prefixes are assigned from time to time, the + list of prefixes may be out of date. It is hoped that a future version of + this module will obtained the prefix list from one or more tables that + can be easily updated by users as needed; however, at present, the + list can only be updated by modifying the source code and recompiling. + Alternatively, prefix validation and hyphenation support may be + dropped from a future version of this module. </para> <sect2> |