postgresql

History

Neil Conway 8e5a10d46c This patch makes the error message strings throughout the backend more compliant with the error message style guide. In particular, errdetail should begin with a capital letter and end with a period, whereas errmsg should not. I also fixed a few related issues in passing, such as fixing the repeated misspelling of "lexeme" in contrib/tsearch2 (per Tom's suggestion).		2006-03-01 06:30:32 +00:00
..
Makefile	contrib uninstall scripts	2006-02-27 12:54:39 +00:00
README.isbn_issn	Add missing /contrib files	2000-06-19 14:02:16 +00:00
isbn_issn.c	This patch makes the error message strings throughout the backend	2006-03-01 06:30:32 +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
uninstall_isbn_issn.sql	contrib uninstall scripts	2006-02-27 12:54:39 +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