Add note about ST_IsValid flag argument being an extension to specs

git-svn-id: http://svn.osgeo.org/postgis/trunk@14854 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/doc/reference_accessor.xml b/doc/reference_accessor.xml
index 146432204f07f838105f0be3a2618bcdf0450e7a..8de123109d14a6faf9500ff48e7fc73273df06ac 100644 (file)
--- a/doc/reference_accessor.xml
+++ b/doc/reference_accessor.xml
@@ -1313,6 +1313,13 @@ Allowed <varname>flags</varname> are documented in <xref linkend="ST_IsValidDeta
                <para>&sfs_compliant;</para>
                <para>&sqlmm_compliant; SQL-MM 3: 5.1.9</para>
 
+               <note>
+                       <para>
+Neither OGC-SFS nor SQL-MM specifications include a flag argument
+for ST_IsValid. The flag is a PostGIS extension.
+                       </para>
+               </note>
+
 
          </refsection>