Updated documentation for X,Y,M and Z

git-svn-id: http://svn.osgeo.org/postgis/trunk@2095 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/TODO b/TODO
index d1aecb8be420e8a8f94912043e6ae30294af5acf..dc54ac7726dcaa2979ce0028636540a854ec948d 100644 (file)
--- a/TODO
+++ b/TODO
@@ -1,6 +1,3 @@
-UPDATE DOCUMENTATION ABOUT X,Y,Z and M functions
-(input MUST be a point)
-
 2005/01/13
 
 - Clean up mapserver connectivity

diff --git a/doc/postgis.xml b/doc/postgis.xml
index 7a8aba99629e6b12ba4a5b35045d978937759db8..c6d23a61c8a1e180ddfe990550408bee43d22e32 100644 (file)
--- a/doc/postgis.xml
+++ b/doc/postgis.xml
@@ -3530,8 +3530,8 @@ dimension
             <term>X(geometry)</term>
 
             <listitem>
-              <para>Return the X coordinate of the point, or NULL
-             if the geometry is not a point.</para>
+              <para>Return the X coordinate of the point.
+             Input must be a point.</para>
             </listitem>
           </varlistentry>
 
@@ -3539,8 +3539,8 @@ dimension
             <term>Y(geometry)</term>
 
             <listitem>
-              <para>Return the Y coordinate of the point, or NULL
-             if the geometry is not a point.</para>
+              <para>Return the Y coordinate of the point.
+             Input must be a point.</para>
             </listitem>
           </varlistentry>
 
@@ -3548,8 +3548,9 @@ dimension
             <term>Z(geometry)</term>
 
             <listitem>
-              <para>Return the Z coordinate of the point, or NULL
-             if the geometry is not a point.</para>
+              <para>Return the Z coordinate of the point,
+             or NULL if not available.
+             Input must be a point.</para>
             </listitem>
           </varlistentry>
 
@@ -3557,8 +3558,10 @@ dimension
             <term>M(geometry)</term>
 
             <listitem>
-              <para>Return the M coordinate of the point, or NULL
-             if the geometry is not a point.</para>
+              <para>Return the M coordinate of the point, 
+             or NULL if not available.
+             Input must be a point.</para>
+
                <note><para>This is not (yet) part of the OGC spec,
                but is listed here to complete the point coordinate
                extractor function list.</para></note>