Index: doc/gtl_custom_point.htm
===================================================================
--- doc/gtl_custom_point.htm	(Revision 82821)
+++ doc/gtl_custom_point.htm	(Arbeitskopie)
@@ -97,6 +97,8 @@
 template &lt;&gt;<br>&nbsp; &nbsp; 
 struct point_mutable_traits&lt;CPoint&gt; {<br>&nbsp; &nbsp; 
 &nbsp; &nbsp; 
+typedef int coordinate_type;<br><br>&nbsp; &nbsp; 
+&nbsp; &nbsp; 
 static inline void set(CPoint&amp; point, orientation_2d orient, int value) {<br>&nbsp; &nbsp; 
 &nbsp; &nbsp; 
 &nbsp; &nbsp; 
Index: doc/gtl_point_concept.htm
===================================================================
--- doc/gtl_point_concept.htm	(Revision 82821)
+++ doc/gtl_point_concept.htm	(Arbeitskopie)
@@ -117,6 +117,8 @@
 <br />
 template &lt;typename T&gt;<br />
 struct point_mutable_traits {<br />
+&nbsp;&nbsp;&nbsp;&nbsp; typedef typename T::coordinate_type coordinate_type;<br />
+<br />
 &nbsp;&nbsp;&nbsp;&nbsp; static void set(T&amp; point, orientation_2d orient, 
 typename point_traits&lt;T&gt;::coordinate_type value) {<br />
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; point.set(orient, value);