code: @Override
  	public void toXML(final StringBuilder builder,
  			final ConfigVerification errors)
  	{
  
  		builder.append("\t<logging>\r\n");
  
  		// DIFFTOOL
  		String pathDiffTool = diffToolField.getText();
  		if (pathDiffTool.length() == 0) {
  			errors.add(new ConfigItem(ConfigItemTypes.WARNING,
  					ConfigErrorKeys.PATH_NOT_SET,
  					"The root folder for all logs and debug"
  							+ " information has not been set."));
  		}
  		if (!pathDiffTool.endsWith(File.separator)
  				&& pathDiffTool.contains(File.separator)) {
  			pathDiffTool += File.separator;
  		}
  
  		builder.append("\t\t<root_folder>\"").append(pathDiffTool).append( "\"</root_folder>\r\n");
  		builder.append("\t\t<diff_tool>\r\n");
  		builder.append("\t\t\t<level>").append(diffToolLogLevelComboBox.getSelectedItem() ).append("</level>\r\n");
  		builder.append("\t\t</diff_tool>\r\n");
  		builder.append("\t</logging>\r\n");
  	}
docs: Adds the xml description of the panels content to the StringBuilder.
  Errors which occur during the xml transformation will be added to the
  ConfigVerification.
  
  @param builder
  Reference to a StringBuilder object
  @param errors
  Reference to the ConfigVerification object