Add some index entries for RAISE and exception handling in PL/PgSQL. Per

suggestion from Rainer Brandt.

doc/src/sgml/plpgsql.sgml

@@ -1,5 +1,5 @@
 <!--
-$PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.59 2005/02/10 05:01:07 neilc Exp $
+$PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.60 2005/02/10 06:08:22 neilc Exp $
 -->
 
 <chapter id="plpgsql"> 
@@ -1901,6 +1901,11 @@ END LOOP;
    <sect2 id="plpgsql-error-trapping">
     <title>Trapping Errors</title>
 
+    <indexterm>
+     <primary>exceptions</primary>
+     <secondary>in PL/PgSQL</secondary>
+    </indexterm>
+
     <para>
      By default, any error occurring in a <application>PL/pgSQL</>
      function aborts execution of the function, and indeed of the
@@ -2339,6 +2344,15 @@ COMMIT;
   <sect1 id="plpgsql-errors-and-messages">
    <title>Errors and Messages</title>
 
+   <indexterm>
+    <primary>RAISE</primary>
+   </indexterm>
+
+   <indexterm>
+    <primary>reporting errors</primary>
+    <secondary>in PL/PgSQL</secondary>
+   </indexterm>
+
    <para>
     Use the <command>RAISE</command> statement to report messages and
     raise errors.