OpenConext / Stepup-Gateway

        $xpathObj->registerNamespace('shibmd', Scope::NS);

        $nodeList = $xpathObj->query($xpath);

        if (!$nodeList || $nodeList->length === 0) {

            $message = sprintf('The xpath "%s" did not result in at least one match.', $xpath);

            throw new ExpectationException($message, $this->getSession());

        }

    }

    /**

        $xpathObj->registerNamespace('mdui', Common::NS);

        $nodeList = $xpathObj->query($xpath);

        if ($nodeList && $nodeList->length > 0) {

            $message = sprintf(

                'The xpath "%s" resulted in "%d" matches, where it should result in no matches"',

                $xpath,

                $nodeList->length

            );

            throw new ExpectationException($message, $this->getSession());

        }

    }

    /**