code: public Integer getIndent() {
  		if (!"yes".equals(get(OutputKeys.INDENT))) {
  			return null;
  		}
  
  		String value = get(INDENT_AMT);
  		return (value == null) ? null : Integer.valueOf(value);
  	}
docs: Gets the number of indent spaces to use for pretty-printing.
  @return the number of indent spaces or null if pretty-printing is
  disabled