code: public void appendChild(int newChild, boolean clone, boolean cloneDepth)
    {
      error(XMLMessages.createXMLMessage(XMLErrorResources.ER_METHOD_NOT_SUPPORTED, null));//"appendChild not yet supported!");
    }
docs: Append a child to the end of the document. Please note that the node
  is always cloned if it is owned by another document.
  
  <p>%REVIEW% "End of the document" needs to be defined more clearly.
  Does it become the last child of the Document? Of the root element?</p>
  
  @param newChild Must be a valid new node handle.
  @param clone true if the child should be cloned into the document.
  @param cloneDepth if the clone argument is true, specifies that the
  clone should include all it's children.