diff --git a/src/org/apache/xml/dtm/ref/DTMNodeProxy.java b/src/org/apache/xml/dtm/ref/DTMNodeProxy.java
index 3ba0959..ad62688 100644
--- a/src/org/apache/xml/dtm/ref/DTMNodeProxy.java
+++ b/src/org/apache/xml/dtm/ref/DTMNodeProxy.java
@@ -75,7 +75,7 @@
  */
 public class DTMNodeProxy
         implements Node, Document, Text, Element, Attr,
-                   ProcessingInstruction, Comment
+                   ProcessingInstruction, Comment, DocumentFragment
 {
 
   /** The DTM for this node. */