added a few reference cross links

git-svn-id: http://svn.osgeo.org/postgis/trunk@4981 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/doc/using_postgis_dataman.xml b/doc/using_postgis_dataman.xml
index cbcd5227b183023d20ca3204e2d9246b625f7d70..59b1f72c81b45114e00f68d58e339173ad40b4c8 100644 (file)
--- a/doc/using_postgis_dataman.xml
+++ b/doc/using_postgis_dataman.xml
@@ -980,7 +980,8 @@ gisdb=# SELECT
         <title>Dimensionally Extended 9 Intersection Model (DE-9IM)</title>
 
         <para>It is sometimes the case that the typical spatial predicates
-        (ST_Contains, ST_Crosses, ST_Intersects, ST_Touches, ...) are
+        (<xref linkend="ST_Contains" />, <xref linkend="ST_Crosses" />, 
+         <xref linkend="ST_Intersects" />, <xref linkend="ST_Touches" />, ...) are
         insufficient in and of themselves to adequately provide that desired
         spatial filter.</para>