} else if (_model instanceof XPathOperationSelectorModel) {
XPathOperationSelectorModel xpathModel = XPathOperationSelectorModel.class.cast(_model);
operationQName = xpathMatch(xpathModel.getExpression(), extractDomDocument(content));
} else if (_model instanceof RegexOperationSelectorModel) {
RegexOperationSelectorModel regexModel = RegexOperationSelectorModel.class.cast(_model);
operationQName = regexMatch(regexModel.getExpression(), extractString(content));
} else {
throw CommonCommonMessages.MESSAGES.unsupportedOperationSelectorConfiguration(_model.toString());
}
if (_defaultNamespace != null && operationQName.getNamespaceURI().equals(XMLConstants.NULL_NS_URI)) {