diff --git a/Doc/Sd1/objectsClasses.xml b/Doc/Sd1/objectsClasses.xml
index e757317eb045c04b65bfd14d2baa664743dfa215..af4df630a5f77c5a7ae1dbeb50f14add17cff7b8 100644
--- a/Doc/Sd1/objectsClasses.xml
+++ b/Doc/Sd1/objectsClasses.xml
@@ -1314,6 +1314,44 @@ public class Circle {
   public void setY(double y) {
     // TODO
   }</programlisting>
+
+                  <para>You may as well extend the constructors of
+                  <classname>Rectangle</classname> and
+                  <classname>Circle</classname> to accept center coordinates
+                  as well:</para>
+
+                  <programlisting language="java">public class Rectangle {
+
+...
+   /**
+    * Rectangle having center coordinates x, y, width and height.
+    * 
+    * @param x The rectangle center's x-coordinate
+    * @param y The rectangle center's y-coordinate
+    * @param width The rectangle's width
+    * @param height The rectangle's height
+    */
+   public Rectangle(double x, double y, double width, double height) {
+     ...
+   }
+  ...
+}</programlisting>
+
+                  <programlisting language="java">public class Circle {
+   ...
+
+   /**
+    * Circle having center coordinates x, y and radius r.
+    * 
+    * @param x The circle center's x-coordinate
+    * @param y The circle center's y-coordinate
+    * @param The circle's radius
+    */
+   public Circle(double x, double y, double radius) {
+     ...
+   }
+  ...
+}</programlisting>
                 </glossdef>
               </glossentry>
 
@@ -1333,8 +1371,8 @@ public class Circle {
                   linkend="glo_SVG"/> code being written to standard output.
                   Use <methodname>System.out.println(...)</methodname> calls
                   to create the desired <xref linkend="glo_SVG"/> output. You
-                  may need <code>\"</code> to represent double quotes as in
-                  the subsequent example or use single attribute quotes
+                  may need <code>\"</code> to escape double quotes as in the
+                  subsequent example or use single attribute quotes
                   instead:</para>
 
                   <programlisting language="java">System.out.println("&lt;rect width=\"20\"" ...</programlisting>
@@ -1359,7 +1397,7 @@ public class Circle {
     r.writeSvg(); 
     
     // Draw a circle as SVG
-    final Circle c = new Circle(1, 1, 3);
+    final Circle c = new Circle(1, 3);
     c.setX(3);
     c.setY(1);
     c.writeSvg();
@@ -1378,7 +1416,7 @@ public class Circle {
 &lt;html&gt;
   &lt;body&gt;
     &lt;svg width='300' height='200' &gt;
-      <emphasis role="bold">&lt;rect width='100.0' height='80.0' x='40.0' y='20.0'' 
+      <emphasis role="bold">&lt;rect width='100.0' height='80.0' x='40.0' y='20.0' 
             style='fill:rgb(0,255,0);stroke-width:3;stroke:rgb(0,0,0)'/&gt;</emphasis>
       <emphasis role="bold">&lt;circle r='60.0' cx='60.0' cy='20.0' 
             style='fill:rgb(0,0,255);stroke-width:3;stroke:rgb(0,0,0)'/&gt;</emphasis>