Expanded estimated_extent() paragraph to document differences between pre

and post pgsql 800.

git-svn-id: http://svn.osgeo.org/postgis/trunk@1551 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/doc/postgis.xml b/doc/postgis.xml
index bec1db92e2d4ffe6e7ac5a93b58023596f598efa..37c269d7c04371568881919321ad458e0472692c 100644 (file)
--- a/doc/postgis.xml
+++ b/doc/postgis.xml
@@ -4401,15 +4401,17 @@ FROM geometry_table;</literallayout>
                  </listitem>
                </varlistentry>
 
-                       <varlistentry>
-                               <term>estimated_extent([schema], table, geocolumn)</term>
-                               <listitem>
-                                       <para> Return the 'estimated' extent of the given spatial table.  The estimated is taken from the geometry column's statistics gathered by running VACUUM ANALYZE, and is statistically about 95% of 'real' extent. The current schema will be used if not specified.  </para>
-                                       <para>NOTE: This is only available with PostgreSQL >= 8.0.0</para>
-                               </listitem>
-                       </varlistentry>
+               <varlistentry>
+                       <term>estimated_extent([schema], table, geocolumn)</term>
+                       <listitem>
+                               <para> Return the 'estimated' extent of the given spatial table.  The estimated is taken from the geometry column's statistics. The current schema will be used if not specified.</para>
 
-        <varlistentry>
+                               <para>For PostgreSQL&gt;=8.0.0 statistics are gathered by VACUUM ANALYZE and resulting extent will be about 95% of the real one.</para>
+                               <para>For PostgreSQL&lt;8.0.0 statistics are gathered by update_geometry_stats() and resulting extent will be exact.</para>
+                       </listitem>
+               </varlistentry>
+
+       <varlistentry>
           <term>find_srid(varchar,varchar,varchar)</term>
 
           <listitem>