return getClass().getName() + "@" + hashCode() + "[" + unclosedPropertiesString() + "]";
return getClass().getName() + "@" + hashCode() + "[id: " + $id + "]";
  public final String toString() {    return getClass().getName() + "@" + hashCode() //$NON-NLS-1$               + "[" + unclosedPropertiesString() + "]"; //$NON-NLS-1$ //$NON-NLS-2$  }