diff --git a/extensions/xforms/nsXFormsUtils.cpp b/extensions/xforms/nsXFormsUtils.cpp
index d1e566b3fe7..7475a27555a 100644
--- a/extensions/xforms/nsXFormsUtils.cpp
+++ b/extensions/xforms/nsXFormsUtils.cpp
@@ -2500,28 +2500,12 @@ nsXFormsUtils::GetModelFromNode(nsIDOMNode *aNode, nsIDOMNode **aModel)
 nsXFormsUtils::IsNodeAssocWithModel(nsIDOMNode *aNode, nsIDOMNode *aModel)
 {
 
-  nsCOMPtr<nsIDOMNode> modelNode;
-
-  nsAutoString namespaceURI;
-  aNode->GetNamespaceURI(namespaceURI);
-
-  // If the node is in the XForms namespace and XTF based, then it should
-  //   be able to be handled by GetModel.  Otherwise it is probably an instance
-  //   node in a instance document.
-  if (namespaceURI.EqualsLiteral(NS_NAMESPACE_XFORMS)) {
-    nsCOMPtr<nsIDOMElement> element = do_QueryInterface(aNode);
-    nsCOMPtr<nsIModelElementPrivate> modelPriv = GetModel(element);
-    modelNode = do_QueryInterface(modelPriv);
-  } else {
-    // We are assuming that if the node coming in isn't a proper XForms element,
-    //   then it is an instance element in an instance doc.  Now we just have
-    //   to determine if the given model contains this instance document.
-    nsCOMPtr<nsIDOMNode> instNode;
-    nsresult rv =
-      nsXFormsUtils::GetInstanceNodeForData(aNode, getter_AddRefs(instNode));
-    if (NS_SUCCEEDED(rv) && instNode) {
-      instNode->GetParentNode(getter_AddRefs(modelNode));
-    }
+  // Determine if the given model contains this instance document.
+  nsCOMPtr<nsIDOMNode> modelNode, instNode;
+  nsresult rv =
+    nsXFormsUtils::GetInstanceNodeForData(aNode, getter_AddRefs(instNode));
+  if (NS_SUCCEEDED(rv) && instNode) {
+    instNode->GetParentNode(getter_AddRefs(modelNode));
   }
 
   return modelNode && (modelNode == aModel);
diff --git a/extensions/xforms/nsXFormsUtils.h b/extensions/xforms/nsXFormsUtils.h
index ec6b2109e1e..b3bc5957e35 100644
--- a/extensions/xforms/nsXFormsUtils.h
+++ b/extensions/xforms/nsXFormsUtils.h
@@ -674,14 +674,7 @@ public:
    * instance() function.
    * The provided node can be an instance node from an instance
    * document and thus be associated to the model in that way (model elements
-   * contain instance elements).  Otherwise the node will be an XForms element
-   * that was used as the context node of the XPath expression (i.e the
-   * XForms control has an attribute that contains an XPath expression).
-   * Form controls are associated with model elements either explicitly through
-   * single-node binding or implicitly (if model cannot by calculated, it
-   * will use the first model element encountered in the document).  The model
-   * can also be inherited from a containing element like xforms:group or
-   * xforms:repeat.
+   * contain instance elements).  
    */
   static NS_HIDDEN_(PRBool) IsNodeAssocWithModel(nsIDOMNode *aNode,
                                                  nsIDOMNode *aModel);