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<!--
-$Header: /cvsroot/pgsql/doc/src/sgml/xplang.sgml,v 1.22 2003/06/30 18:31:42 tgl Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/xplang.sgml,v 1.23 2003/08/31 17:32:21 petere Exp $
-->
<chapter id="xplang">
<title id="xplang-title">Procedural Languages</title>
+ <indexterm zone="xplang">
+ <primary>procedural language</primary>
+ </indexterm>
+
<para>
<productname>PostgreSQL</productname> allows users to add new
programming languages to be available for writing functions and