code: @Pure
  	public boolean isTemporaryChange() {
  		final Object src = getSource();
  		if (src instanceof MapLayer) {
  			return ((MapLayer) src).isTemporaryLayer();
  		}
  		return false;
  	}
docs: Replies if the change in the layer was marked as temporary.
  The usage of this information depends on the listener's behaviour.
  
  @return <code>true</code> if the change is temporary,
  otherwise <code>false</code>