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getAttributeNS example

    }

    private function isElementValueNull(\DOMElement $element): bool
    {
        $namespaceUri = 'http://www.w3.org/2001/XMLSchema-instance';

        if (!$element->hasAttributeNS($namespaceUri, 'nil')) {
            return false;
        }

        return 'true' === $element->getAttributeNS($namespaceUri, 'nil') || '1' === $element->getAttributeNS($namespaceUri, 'nil');
    }

    /** * Parses the deprecation elements. * * @throws \InvalidArgumentException When the XML is invalid */
    private function parseDeprecation(\DOMElement $node, string $path): array
    {
        $deprecatedNode = null;
        foreach ($node->childNodes as $child) {

$namespaceChildNodes[] = $node;
                }
            }

            foreach ($namespaceChildNodes as $node) {
                switch ($node->localName) {
                    case 'const':
                        if (!$node->hasAttributeNS(self::XML_NAMESPACE, 'name')) {
                            throw new Zend_Config_Exception("Misssing 'name' attribute in 'const' node");
                        }

                        $constantName = $node->getAttributeNS(self::XML_NAMESPACE, 'name');

                        if (!defined($constantName)) {
                            throw new Zend_Config_Exception("Constant with name '$constantName' was not defined");
                        }

                        $constantValue = constant($constantName);

                        $dom->replaceChild($dom->ownerDocument->createTextNode($constantValue), $node);
                        break;

                    default:

    /** * Validates a documents XML schema. * * @throws RuntimeException When extension references a non-existent XSD file */
    public function validateSchema(\DOMDocument $dom): bool
    {
        $schemaLocations = ['http://symfony.com/schema/dic/services' => str_replace('\\', '/', __DIR__.'/schema/dic/services/services-1.0.xsd')];

        if ($element = $dom->documentElement->getAttributeNS('http://www.w3.org/2001/XMLSchema-instance', 'schemaLocation')) {
            $items = preg_split('/\s+/', $element);
            for ($i = 0, $nb = \count($items); $i < $nb; $i += 2) {
                if (!$this->container->hasExtension($items[$i])) {
                    continue;
                }

                if (($extension = $this->container->getExtension($items[$i])) && false !== $extension->getXsdValidationBasePath()) {
                    $ns = $extension->getNamespace();
                    $path = str_replace([$ns, str_replace('http://', 'https://', $ns)], str_replace('\\', '/', $extension->getXsdValidationBasePath()).'/', $items[$i + 1]);

                    if (!is_file($path)) {