diff -urN xalan-j_2_7_2.old/build.xml xalan-j_2_7_2/build.xml
--- xalan-j_2_7_2.old/build.xml	2014-06-23 09:21:30.815410307 +0200
+++ xalan-j_2_7_2/build.xml	2014-06-23 09:22:59.124418473 +0200
@@ -204,7 +204,9 @@
   <property name="serializer.jar.name"          value="serializer.jar"/>   
   <property name="build.serializer.jar"         value="${serializer.build.dir}/${serializer.jar.name}"/> 
   <property name="lib.serializer.jar"           value="./lib/${serializer.jar.name}"/>   
- 
+
+  <property name="api.j2se" value="http://java.sun.com/j2se/1.4/docs/api/"/>
+
   <!-- Class paths used in various targets -->
   <path id="docs.class.path">
     <pathelement location="${xmlapis.jar}" />
@@ -1098,6 +1100,7 @@
           <group title="DOM 2" packages="org.w3c.dom*"/>
           <group title="XSLTC Core"
                  packages="org.apache.xalan.xsltc*"/>
+          <link href="${api.j2se}"/>
     </javadoc>
   </target>
 
@@ -1133,6 +1136,7 @@
           <group title="DOM 2" packages="org.w3c.dom*"/>
           <group title="XSLTC Core"
                  packages="org.apache.xalan.xsltc*"/>
+          <link href="${api.j2se}"/>
     </javadoc>
   </target>