docs: @Pure
  	public static boolean isAttributeExhibitable() {
  		final Preferences prefs = Preferences.userNodeForPackage(BusLayerConstants.class);
  		if (prefs != null) {
  			return prefs.getBoolean("EXHIBIT_ATTRIBUTES", DEFAULT_ATTRIBUTE_EXHIBITION); //$NON-NLS-1$
  		}
  		return DEFAULT_ATTRIBUTE_EXHIBITION;
  	}