168482: ref dtd

docs/devGuideDB/ltw.xml

@@ -194,6 +194,10 @@
 
 		  ]]></programlisting>
           
+            <para>
+                The DTD defining the format of this file is available here: 
+                http://www.eclipse.org/aspectj/dtd/aspectj.dtd. 
+            </para>
             <para>
                 An aop.xml file contains two key sections: <literal>aspects</literal> defines one
                 or more aspects to the weaver and controls which aspects are to be