Template.php

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<?php
namespace Magento\Framework\View\TemplateEngine\Xhtml;

class Template
{
    const XML_VERSION = '1.0';

    const XML_ENCODING = 'UTF-8';

    protected $logger;

    protected $templateNode;

    public function __construct(
        \Psr\Log\LoggerInterface $logger,
        $content
    ) {
        $this->logger = $logger;
        $document = new \DOMDocument(static::XML_VERSION, static::XML_ENCODING);
        $document->loadXML($content);
        $this->templateNode = $document->documentElement;
    }

    public function getDocumentElement()
    {
        return $this->templateNode;
    }

    public function append($content)
    {
        $newFragment = $this->templateNode->ownerDocument->createDocumentFragment();
        $newFragment->appendXML($content);
        $this->templateNode->appendChild($newFragment);
    }

    public function __toString()
    {
        try {
            $this->templateNode->ownerDocument->normalizeDocument();
            $result = $this->templateNode->ownerDocument->saveHTML();
        } catch (\Exception $e) {
            $this->logger->critical($e->getMessage());
            $result = '';
        }
        return $result;
    }
}