Add some caveats to the contrib/isn docs.

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Robert Haas 2010-10-19 22:46:55 -04:00
parent 6d1af7b218
commit 4b6623a7e8

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@ -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list of prefixes may be out of date.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>