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<Chapter>
<TITLE>Introduction</TITLE>
<Para>
This document is the programmer's manual for the
<Ulink url="http://postgresql.org/"><ProductName>PostgreSQL</ProductName></Ulink>
database management system, originally developed at the University
of California at Berkeley. <ProductName>PostgreSQL</ProductName> is based on
<Ulink url="http://s2k-ftp.CS.Berkeley.EDU:8000/postgres/postgres.html">
<ProductName>Postgres release 4.2</ProductName></Ulink>.
The <ProductName>Postgres</ProductName> project,
led by Professor Michael Stonebraker, has been sponsored by the
Defense Advanced Research Projects Agency (<Acronym>DARPA</Acronym>), the
Army Research Office (<Acronym>ARO</Acronym>), the National Science
Foundation (<Acronym>NSF</Acronym>), and ESL, Inc.
</Para>
<Para>
The first part of this manual
explains the
<ProductName>Postgres</ProductName> approach to extensibility and describe how
users can extend <ProductName>Postgres</ProductName> by adding user-defined types,
operators, aggregates, and both query language and programming language functions.
After an extremely brief
overview of the <ProductName>Postgres</ProductName> rule system, we discuss
the trigger and SPI interfaces.
The manual concludes with a detailed description of the programming interfaces and
support libraries for various languages.
</Para>
<Para>
We assume proficiency with UNIX and C programming.
</Para>
<Sect1>
<Title>Copyrights and Trademarks</Title>
<Para>
<ProductName>PostgreSQL</ProductName> is copyright (C) 1996-8 by the PostgreSQL Global Development Group,
and is distributed under the terms of the Berkeley license.
<Para>
<ProductName>Postgres95</ProductName> is copyright (C) 1994-5 by the Regents of the University of California.
Permission to use, copy, modify, and distribute this software and its documentation
for any purpose, without fee, and without a written agreement is hereby granted,
provided that the above copyright notice and this paragraph and the following two
paragraphs appear in all copies.
</Para>
<Para>
In no event shall the University of California be liable to
any party for direct, indirect, special, incidental, or consequential
damages, including lost profits, arising out of the use of this
software and its documentation, even if the University of California
has been advised of the possibility of such damage.
</Para>
<Para>
The University of California specifically disclaims any
warranties, including, but not limited to, the implied warranties
of merchantability and fitness for a particular purpose.
The software provided hereunder is on an "as-is" basis, and
the University of California has no obligations to provide
maintainance, support, updates, enhancements, or modifications.
</Para>
<Para>
<Acronym>UNIX</Acronym> is a trademark of X/Open, Ltd. Sun4, SPARC, SunOS
and Solaris are trademarks of Sun Microsystems, Inc. DEC,
DECstation, Alpha AXP and ULTRIX are trademarks of Digital
Equipment Corp. PA-RISC and HP-UX are trademarks of
Hewlett-Packard Co. OSF/1 is a trademark of the Open
Software Foundation.
</Para>
</Chapter>
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