Merge some user-submitted suggestions for improvement into the

documentation. Mostly add some <xref>s, fix a few typos, and
document that zlib is required in the installation docs.

doc/src/sgml/datatype.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.161 2005/10/14 11:47:56 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.162 2005/10/15 01:47:11 neilc Exp $
 -->
 
  <chapter id="datatype">
@@ -16,9 +16,9 @@ $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.161 2005/10/14 11:47:56 momjia
 
   <para>
    <productname>PostgreSQL</productname> has a rich set of native data
-   types available to users.
-   Users may add new types to <productname>PostgreSQL</productname> using the
-   <command>CREATE TYPE</command> command.
+   types available to users.  Users may add new types to
+   <productname>PostgreSQL</productname> using the <xref
+   linkend="sql-createtype" endterm="sql-createtype-title"> command.
   </para>
 
   <para>

doc/src/sgml/extend.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/extend.sgml,v 1.29 2004/12/30 03:13:56 tgl Exp $
+$PostgreSQL: pgsql/doc/src/sgml/extend.sgml,v 1.30 2005/10/15 01:47:11 neilc Exp $
 -->
 
  <chapter id="extend">
@@ -131,12 +131,14 @@ $PostgreSQL: pgsql/doc/src/sgml/extend.sgml,v 1.29 2004/12/30 03:13:56 tgl Exp $
 
     <para>
      Composite types, or row types, are created whenever the user
-     creates a table; it's also possible to define a
-     <quote>stand-alone</> composite type with no associated table.  A
-     composite type is simply a list of base types with associated
-     field names.  A value of a composite type is a row or record of
-     field values.  The user can access the component fields from
-     <acronym>SQL</> queries.
+     creates a table. It is also possible to use <xref
+     linkend="sql-createtype" endterm="sql-createtype-title"> to
+     define a <quote>stand-alone</> composite type with no associated
+     table.  A composite type is simply a list of types with
+     associated field names.  A value of a composite type is a row or
+     record of field values.  The user can access the component fields
+     from <acronym>SQL</> queries. Refer to <xref linkend="rowtypes">
+     for more information on composite types.
     </para>
    </sect2>
 

doc/src/sgml/installation.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/installation.sgml,v 1.241 2005/07/20 23:57:46 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/installation.sgml,v 1.242 2005/10/15 01:47:11 neilc Exp $ -->
 
 <chapter id="installation">
  <title><![%standalone-include[<productname>PostgreSQL</>]]>
@@ -94,9 +94,9 @@ su - postgres
 
     <listitem>
      <para>
-      <application>gzip</> is needed to unpack the distribution in the
-      first place.<![%standalone-include;[  If you are reading this, you probably already got
-      past that hurdle.]]>
+      <application>tar</> is required to unpack the source
+      distribution in the first place, in addition to either
+      <application>gzip</> or <application>bzip2</>.
      </para>
     </listitem>
 
@@ -120,6 +120,21 @@ su - postgres
      </para>
     </listitem>
 
+    <listitem>
+     <para>
+      <indexterm>
+       <primary>zlib</primary>
+      </indexterm>
+
+      The <productname>zlib</productname> compression library will be
+      used by default. If you don't want to use it then you must
+      specify the <option>--without-zlib</option> option for
+      <filename>configure</filename>. Using this option disables
+      support for compressed archives in <application>pg_dump</> and
+      <application>pg_restore</>.
+     </para>
+    </listitem>
+
     <listitem>
      <para>
       <indexterm>

doc/src/sgml/plpgsql.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.77 2005/10/06 20:51:20 neilc Exp $
+$PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.78 2005/10/15 01:47:11 neilc Exp $
 -->
 
 <chapter id="plpgsql"> 
@@ -965,14 +965,15 @@ $$ LANGUAGE plpgsql;
     <para>
      In the case of <function>logfunc1</function>, the
      <productname>PostgreSQL</productname> main parser knows when
-     preparing the plan for the <command>INSERT</command>, that the string 
-     <literal>'now'</literal> should be interpreted as 
-     <type>timestamp</type> because the target column of <classname>logtable</classname>
-     is of that type. Thus, it will make a constant from it at this
-     time and this constant value is then used in all invocations of 
-     <function>logfunc1</function> during the lifetime of the
-     session. Needless to say that this isn't what the
-     programmer wanted.
+     preparing the plan for the <command>INSERT</command> that the
+     string <literal>'now'</literal> should be interpreted as
+     <type>timestamp</type> because the target column of
+     <classname>logtable</classname> is of that type. Thus,
+     <literal>'now'</literal> will be converted to a constant when the
+     <command>INSERT</command> is planned, and then used in all
+     invocations of <function>logfunc1</function> during the lifetime
+     of the session. Needless to say, this isn't what the programmer
+     wanted.
     </para>
 
     <para>
@@ -985,7 +986,7 @@ $$ LANGUAGE plpgsql;
      <application>PL/pgSQL</application> interpreter casts this
      string to the <type>timestamp</type> type by calling the
      <function>text_out</function> and <function>timestamp_in</function>
-     functions for the conversion.  So, the computed time stamp is updated
+     functions for the conversion.  So, the computed timestamp is updated
      on each execution as the programmer expects.
     </para>
 
@@ -1452,8 +1453,8 @@ GET DIAGNOSTICS integer_var = ROW_COUNT;
          </itemizedlist>
 
      <literal>FOUND</literal> is a local variable within each
-     <application>PL/pgSQL</application> function; so any changes
-     to it affect only the current function.
+     <application>PL/pgSQL</application> function; any changes to it
+     affect only the current function.
     </para>
 
    </sect2>

doc/src/sgml/ref/prepare.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/prepare.sgml,v 1.15 2004/10/29 19:40:33 tgl Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/prepare.sgml,v 1.16 2005/10/15 01:47:12 neilc Exp $
 PostgreSQL documentation
 -->
 
@@ -63,7 +63,8 @@ PREPARE <replaceable class="PARAMETER">plan_name</replaceable> [ (<replaceable c
    also means that a single  prepared statement cannot be used by
    multiple simultaneous database clients; however, each client can create
    their own prepared statement to use.  The prepared statement can be
-   manually cleaned up using the <command>DEALLOCATE</> command.
+   manually cleaned up using the <xref linkend="sql-deallocate"
+   endterm="sql-deallocate-title"> command.
   </para>
 
   <para>

doc/src/sgml/xfunc.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/xfunc.sgml,v 1.105 2005/10/14 20:48:18 adunstan Exp $
+$PostgreSQL: pgsql/doc/src/sgml/xfunc.sgml,v 1.106 2005/10/15 01:47:12 neilc Exp $
 -->
 
  <sect1 id="xfunc">
@@ -881,9 +881,9 @@ CREATE FUNCTION test(int, int) RETURNS int
     Every function has a <firstterm>volatility</> classification, with
     the possibilities being <literal>VOLATILE</>, <literal>STABLE</>, or
     <literal>IMMUTABLE</>.  <literal>VOLATILE</> is the default if the
-    <command>CREATE FUNCTION</command> command does not specify a category.
-    The volatility category is a promise to the optimizer about the behavior
-    of the function:
+    <xref linkend="sql-createfunction" endterm="sql-createfunction-title">
+    command does not specify a category.  The volatility category is a
+    promise to the optimizer about the behavior of the function:
 
    <itemizedlist>
     <listitem>
@@ -1180,8 +1180,9 @@ CREATE FUNCTION square_root(double precision) RETURNS double precision
     file is retained in memory.  Future calls in the same session to
     the function(s) in that file will only incur the small overhead of
     a symbol table lookup.  If you need to force a reload of an object
-    file, for example after recompiling it, use the <command>LOAD</>
-    command or begin a fresh session.
+    file, for example after recompiling it, use the <xref
+    linkend="sql-load" endterm="sql-load-title"> command or begin a
+    fresh session.
    </para>
 
    <para>
@@ -1652,7 +1653,7 @@ CREATE FUNCTION copytext(text) RETURNS text
      LANGUAGE C STRICT;
 
 CREATE FUNCTION concat_text(text, text) RETURNS text
-     AS '<replaceable>DIRECTORY</replaceable>/funcs', 'concat_text',
+     AS '<replaceable>DIRECTORY</replaceable>/funcs', 'concat_text'
      LANGUAGE C STRICT;
 </programlisting>
     </para>