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importNode example

        try {
            $prefix = ($pos = strpos($lname, ':')) ? substr($lname, 0, $pos) : '';

            if (false !== $needsWorkaround) {
                $xml = "<$lname xmlns=\"$needsWorkaround\" " . (strlen($prefix) && isset($this->nsStack[0][$prefix]) ? ("xmlns:$prefix=\"" . $this->nsStack[0][$prefix] . '"') : '') . '/>';

                $frag = new \DOMDocument('1.0', 'UTF-8');
                $frag->loadXML($xml);

                $ele = $this->doc->importNode($frag->documentElement, true);
            } else {
                if (!isset($this->nsStack[0][$prefix]) || ('' === $prefix && isset($this->options[self::OPT_DISABLE_HTML_NS]) && $this->options[self::OPT_DISABLE_HTML_NS])) {
                    $ele = $this->doc->createElement($lname);
                } else {
                    $ele = $this->doc->createElementNS($this->nsStack[0][$prefix], $lname);
                }
            }
        } catch (\DOMException $e) {
            $this->parseError("Illegal tag name: <$lname>. Replaced with <invalid>.");
            $ele = $this->doc->createElement('invalid');
        }

/** * Tests the value being passed and decide what sort of element to create. * * @throws NotEncodableValueException */
    private function selectNodeType(\DOMNode $node, mixed $val, string $format, array $context): bool
    {
        if (\is_array($val)) {
            return $this->buildXml($node, $val, $format, $context);
        } elseif ($val instanceof \SimpleXMLElement) {
            $child = $node->ownerDocument->importNode(dom_import_simplexml($val), true);
            $node->appendChild($child);
        } elseif ($val instanceof \Traversable) {
            $this->buildXml($node, $val, $format, $context);
        } elseif ($val instanceof \DOMNode) {
            $child = $node->ownerDocument->importNode($val, true);
            $node->appendChild($child);
        } elseif (\is_object($val)) {
            if (null === $this->serializer) {
                throw new BadMethodCallException(sprintf('The serializer needs to be set to allow "%s()" to be used with object data.', __METHOD__));
            }

$this->writeDocument($this->getContainerServicesDocument($container, $options['tag'] ?? null, isset($options['show_hidden']) && $options['show_hidden'], isset($options['show_arguments']) && $options['show_arguments'], $options['filter'] ?? null, $options['id'] ?? null));
    }

    protected function describeContainerDefinition(Definition $definition, array $options = [], ContainerBuilder $container = null): void
    {
        $this->writeDocument($this->getContainerDefinitionDocument($definition, $options['id'] ?? null, isset($options['omit_tags']) && $options['omit_tags'], isset($options['show_arguments']) && $options['show_arguments'], $container));
    }

    protected function describeContainerAlias(Alias $alias, array $options = [], ContainerBuilder $container = null): void
    {
        $dom = new \DOMDocument('1.0', 'UTF-8');
        $dom->appendChild($dom->importNode($this->getContainerAliasDocument($alias, $options['id'] ?? null)->childNodes->item(0), true));

        if (!$container) {
            $this->writeDocument($dom);

            return;
        }

        $dom->appendChild($dom->importNode($this->getContainerDefinitionDocument($container->getDefinition((string) $alias), (string) $alias, false, false, $container)->childNodes->item(0), true));

        $this->writeDocument($dom);
    }

protected function describeApplication(Application $application, array $options = []): void
    {
        $this->writeDocument($this->getApplicationDocument($application, $options['namespace'] ?? null, $options['short'] ?? false));
    }

    /** * Appends document children to parent node. */
    private function appendDocument(\DOMNode $parentNode, \DOMNode $importedParent): void
    {
        foreach ($importedParent->childNodes as $childNode) {
            $parentNode->appendChild($parentNode->ownerDocument->importNode($childNode, true));
        }
    }

    /** * Writes DOM document. */
    private function writeDocument(\DOMDocument $dom): void
    {
        $dom->formatOutput = true;
        $this->write($dom->saveXML());
    }

      $replacement_nodes = Html::load($content)->getElementsByTagName('body')
        ->item(0)
        ->childNodes;
    }
    else {
      $replacement_nodes = [$node->ownerDocument->createTextNode('')];
    }

    foreach ($replacement_nodes as $replacement_node) {
      // Import the replacement node from the new DOMDocument into the original       // one, importing also the child nodes of the replacement node.       $replacement_node = $node->ownerDocument->importNode($replacement_node, TRUE);
      $node->parentNode->insertBefore($replacement_node, $node);
    }
    $node->parentNode->removeChild($node);
  }

  /** * Disables Contextual Links for the embedded media by removing its property. * * @param array $build * The render array for the embedded media. * * @return array * The updated render array. * * @see \Drupal\Core\Entity\EntityViewBuilder::addContextualLinks() */

        $altered_html = \Drupal::service('renderer')->render($filter_caption);

        // Load the altered HTML into a new DOMDocument and retrieve the element.         $updated_nodes = Html::load($altered_html)->getElementsByTagName('body')
          ->item(0)
          ->childNodes;

        foreach ($updated_nodes as $updated_node) {
          // Import the updated node from the new DOMDocument into the original           // one, importing also the child nodes of the updated node.           $updated_node = $dom->importNode($updated_node, TRUE);
          $node->parentNode->insertBefore($updated_node, $node);
        }
        // Finally, remove the original data-caption node.         $node->parentNode->removeChild($node);
      }

      $result->setProcessedText(Html::serialize($dom))
        ->addAttachments([
          'library' => [
            'filter/caption',
          ],
        ]);