[postgis-commits] svn - r2771 - trunk/doc

[postgis-commits at postgis.refractions.net]

Author: pramsey
Date: 2008-04-22 07:54:07 -0700 (Tue, 22 Apr 2008)
New Revision: 2771

Modified:
   trunk/doc/postgis.xml
Log:
envelope doco fix


Modified: trunk/doc/postgis.xml
===================================================================
--- trunk/doc/postgis.xml	2008-04-12 18:39:39 UTC (rev 2770)
+++ trunk/doc/postgis.xml	2008-04-22 14:54:07 UTC (rev 2771)
@@ -3340,8 +3340,10 @@
             <term>ST_Envelope(geometry)</term>
 
             <listitem>
-              <para>Returns a POLYGON representing the bounding box of the
-              geometry.</para>
+              <para>Returns a vald geometry (POINT, LINESTRING or POLYGON) 
+              representing the bounding box of the geometry. Degenerate
+              cases (vertical lines, point) will return a geometry of
+              lower dimension than POLYGON.</para>
 
               <para>OGC SPEC s2.1.1.1 - The minimum bounding box for this
               Geometry, returned as a Geometry. The polygon is defined by the