diff --git a/reference/objaggregation/reference.xml b/reference/objaggregation/reference.xml
index 2f2b2f330c..c386871afa 100644
--- a/reference/objaggregation/reference.xml
+++ b/reference/objaggregation/reference.xml
@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.6 $ -->
+<!-- $Revision: 1.7 $ -->
  <reference id="ref.objaggregation">
   <title>Object Aggregation/Composition Functions</title>
   <titleabbrev>Object Aggregation</titleabbrev>
 
-  <partintro id="objaggregation.partintro">
+  <partintro>
     &warn.experimental;
     <section id="objaggregation.intro">
      &reftitle.intro;