postgresql

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History

Tom Lane a0ffab351e Magic blocks don't do us any good unless we use 'em ... so install one in every shared library.		2006-05-30 22:12:16 +00:00
..
isbn_issn.c	Magic blocks don't do us any good unless we use 'em ... so install one	2006-05-30 22:12:16 +00:00
isbn_issn.sql.in	Clean up CREATE FUNCTION syntax usage in contrib and elsewhere, in	2006-02-27 16:09:50 +00:00
Makefile
README.isbn_issn
uninstall_isbn_issn.sql	Fix a number of syntax errors in contrib modules' uninstall scripts.	2006-03-13 18:04:58 +00:00

README.isbn_issn

ISBN (books) and ISSN (serials)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This directory contains definitions for a couple of PostgreSQL
external types, for a couple of international-standard namespaces:
ISBN (books) and ISSN (serials).  Rather than just using a char()
member of the appropriate length, I wanted my database to include
the validity-checking that both these numbering systems were designed
to encompass.  A little bit of research revealed the formulae
for computing the check digits, and I also included some validity
constraints on the number of hyphens.

The internal representation of these types is intended to be
compatible with `char16', in the (perhaps vain) hope that
this will make it possible to create indices of these types
using char16_ops.

These are based on Tom Ivar Helbekkmo's IP address type definition,
from which I have copied the entire form of the implementation.

Garrett A. Wollman, August 1998