code: public static XpathEngine newXpathEngine() {
          XpathEngine eng = new org.custommonkey.xmlunit.jaxp13.Jaxp13XpathEngine();
          if (namespaceContext != null) {
              eng.setNamespaceContext(namespaceContext);
          }
          return eng;
      }
docs: Obtains an XpathEngine to use in XPath tests.