DatatypeFactory.newInstance().newXMLGregorianCalendar();
        TransformerFactory.newInstance().newTransformer();
        SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
        XPathFactory.newInstance().newXPath();
    }

    public XPath createXPath(final Consumer<XPathFactory> builder) {
        try {
            final XPathFactory factory = XPathFactory.newInstance();
            builder.accept(factory);
            return factory.newXPath();
        } catch (final Exception e) {
            throw new CrawlerSystemException("Failed to create XPath instance.", e);
        }
    }

    /**
     *  Use an XPath string to select a nodelist.

                DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
                documentBuilder.setErrorHandler(new PropagatingErrorHandler());
                XPath xpath = xPathFactory.newXPath();
                XPathExpression expression = xpath.compile(PARSE_EXPRESSION);

                NodeList nodes = (NodeList) expression.evaluate(documentBuilder.parse(toolchain), XPathConstants.NODESET);

			},
			expectedErrs: field.ErrorList{field.Invalid(newPath.Child("KubeIPVSConfiguration.TCPTimeout"), metav1.Duration{Duration: -1 * time.Second}, "must be greater than or equal to 0"),
				field.Invalid(newPath.Child("KubeIPVSConfiguration.TCPFinTimeout"), metav1.Duration{Duration: -1 * time.Second}, "must be greater than or equal to 0"),

	// value is immutable.
	if pc.Value != oldPc.Value {
		allErrs = append(allErrs, field.Forbidden(field.NewPath("value"), "may not be changed in an update."))
	}
	// preemptionPolicy is immutable.
	allErrs = append(allErrs, apivalidation.ValidateImmutableField(pc.PreemptionPolicy, oldPc.PreemptionPolicy, field.NewPath("preemptionPolicy"))...)
	return allErrs

	allErrs = append(allErrs, validateClassParameters(parameters.GeneratedFrom, field.NewPath("generatedFrom"))...)
	allErrs = append(allErrs, validateResourceFilters(parameters.Filters, field.NewPath("filters"), filtersStored)...)
	allErrs = append(allErrs, validateVendorParameters(parameters.VendorParameters, field.NewPath("vendorParameters"))...)
	return allErrs
}

	}

	if len(roleBinding.RoleRef.Name) == 0 {
		allErrs = append(allErrs, field.Required(field.NewPath("roleRef", "name"), ""))
	} else {
		for _, msg := range ValidateRBACName(roleBinding.RoleRef.Name, false) {

		if len(options.ResourceVersion) == 0 {
			allErrs = append(allErrs, field.Forbidden(field.NewPath("resourceVersionMatch"), "resourceVersionMatch is forbidden unless resourceVersion is provided"))
		}
		if len(options.Continue) > 0 {
			allErrs = append(allErrs, field.Forbidden(field.NewPath("resourceVersionMatch"), "resourceVersionMatch is forbidden when continue is provided"))
		}

		expectedErrors: field.ErrorList{
			field.Required(field.NewPath("spec").Child("rules").Index(0).Child("subjects").Index(0).Child("serviceAccount"), "serviceAccount is required when subject kind is 'ServiceAccount'"),
			field.Forbidden(field.NewPath("spec").Child("rules").Index(0).Child("subjects").Index(0).Child("user"), "user is forbidden when subject kind is not 'User'"),

	allErrs = append(allErrs, validateProvisioner(storageClass.Provisioner, field.NewPath("provisioner"))...)
	allErrs = append(allErrs, validateParameters(storageClass.Parameters, true, field.NewPath("parameters"))...)
	allErrs = append(allErrs, validateReclaimPolicy(storageClass.ReclaimPolicy, field.NewPath("reclaimPolicy"))...)