code: public void setOutlineEntryFormat(String formatWithoutNumbers, String formatWithNumbers) {
  		if (!Strings.isEmpty(formatWithoutNumbers)) {
  			this.outlineEntryWithoutNumberFormat = formatWithoutNumbers;
  		}
  		if (!Strings.isEmpty(formatWithNumbers)) {
  			this.outlineEntryWithNumberFormat = formatWithNumbers;
  		}
  	}
docs: Change the formats to be applied to the outline entries.
  
  <p>The format must be compatible with {@link MessageFormat}.
  
  <p>If section auto-numbering is on,
  the first parameter <code>{0}</code> equals to the prefix,
  the second parameter <code>{1}</code> equals to the string representation of the section number,
  the third parameter <code>{2}</code> equals to the title text, and the fourth parameter
  <code>{3}</code> is the reference id of the section.
  
  <p>If section auto-numbering is off,
  the first parameter <code>{0}</code> equals to the prefix,
  the second parameter <code>{1}</code> equals to the title text, and the third parameter
  <code>{2}</code> is the reference id of the section.
  
  @param formatWithoutNumbers the format for the outline entries without section numbers.
  @param formatWithNumbers the format for the outline entries with section numbers.