Consistently use interface methods for inter-node invocations
diff --git a/aspects/dom-aspects/src/main/java/org/apache/axiom/dom/DOMNode.java b/aspects/dom-aspects/src/main/java/org/apache/axiom/dom/DOMNode.java
index 4386250..1e0a9a5 100644
--- a/aspects/dom-aspects/src/main/java/org/apache/axiom/dom/DOMNode.java
+++ b/aspects/dom-aspects/src/main/java/org/apache/axiom/dom/DOMNode.java
@@ -34,4 +34,6 @@
      *         namespace context of this node is defined to be empty
      */
     CoreElement getNamespaceContext();
+
+    void normalize(DOMConfigurationImpl config);
 }