code: public void writeStylesAutomaticStyles(final XMLUtil util, final Appendable appendable)
              throws IOException {
          final Iterable<ObjectStyle> styles = this.objectStylesContainer
                  .getValues(Dest.STYLES_AUTOMATIC_STYLES);
          for (final ObjectStyle style : styles)
              assert style.isHidden() : style.toString();
  
          this.write(styles, util, appendable);
      }
docs: Write styles to styles.xml/automatic-styles
  
  @param util   an util
  @param appendable the destination
  @throws IOException if an I/O error occurs