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postgresql/contrib/isbn_issn
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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.
2000-10-20 21:04:27 +00:00
..
isbn_issn.c Update to /contrib from Karel. 2000-06-19 13:54:50 +00:00
isbn_issn.sql.in Update to /contrib from Karel. 2000-06-19 13:54:50 +00:00
Makefile Add support for VPATH builds, that is, building somewhere else than in the 2000-10-20 21:04:27 +00:00
README.isbn_issn Add missing /contrib files 2000-06-19 14:02:16 +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