code: public static DocumentBuilder newControlParser()
          throws ConfigurationException {
          try {
              controlBuilderFactory = getControlDocumentBuilderFactory();
              DocumentBuilder builder =
                  controlBuilderFactory.newDocumentBuilder();
              if (controlEntityResolver!=null) {
                  builder.setEntityResolver(controlEntityResolver);
              }
              return builder;
          } catch (ParserConfigurationException ex) {
              throw new ConfigurationException(ex);
          }
      }
docs: Get the <code>DocumentBuilder</code> instance used to parse the control
  XML in an XMLTestCase.
  @return parser for control values
  @throws ConfigurationException