code: public Icon<ConnectorDescriptor> getOrCreateIcon()
     {
        Node node = model.getOrCreate("icon");
        Icon<ConnectorDescriptor> icon = new IconImpl<ConnectorDescriptor>(this, "icon", model, node);
        return icon;
     }
docs: If not already created, a new <code>icon</code> element with the given value will be created.
  Otherwise, the existing <code>icon</code> element will be returned.
  @return  a new or existing instance of <code>Icon<ConnectorDescriptor></code>