postgres

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Peter Eisentraut 805e431a38 Add support for VPATH builds, that is, building somewhere else than in the source directory. This involves mostly makefiles using $(srcdir) when they might have used ".". (Regression tests don't work with this, yet.) Sort out usage of CPPFLAGS, CFLAGS (and CXXFLAGS). Add "override" keyword in most places, to preserve necessary flags even when the user overrode the flags.		25 years ago
..
Makefile	Add support for VPATH builds, that is, building somewhere else than in the	25 years ago
README.isbn_issn	Add missing /contrib files	26 years ago
isbn_issn.c	Update to /contrib from Karel.	26 years ago
isbn_issn.sql.in	Update to /contrib from Karel.	26 years ago

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