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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. |
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isbn_issn.c | ||
isbn_issn.sql.in | ||
Makefile | ||
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