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    <h3>Editing: Node.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php declare(strict_types=1);
/*
 * This file is part of phpunit/php-code-coverage.
 *
 * (c) Sebastian Bergmann &lt;sebastian@phpunit.de&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace SebastianBergmann\CodeCoverage\Report\Xml;

use DOMDocument;
use DOMElement;

/**
 * @internal This class is not covered by the backward compatibility promise for phpunit/php-code-coverage
 */
abstract class Node
{
    /**
     * @var DOMDocument
     */
    private $dom;

    /**
     * @var DOMElement
     */
    private $contextNode;

    public function __construct(DOMElement $context)
    {
        $this-&gt;setContextNode($context);
    }

    public function dom(): DOMDocument
    {
        return $this-&gt;dom;
    }

    public function totals(): Totals
    {
        $totalsContainer = $this-&gt;contextNode()-&gt;firstChild;

        if (!$totalsContainer) {
            $totalsContainer = $this-&gt;contextNode()-&gt;appendChild(
                $this-&gt;dom-&gt;createElementNS(
                    'https://schema.phpunit.de/coverage/1.0',
                    'totals'
                )
            );
        }

        return new Totals($totalsContainer);
    }

    public function addDirectory(string $name): Directory
    {
        $dirNode = $this-&gt;dom()-&gt;createElementNS(
            'https://schema.phpunit.de/coverage/1.0',
            'directory'
        );

        $dirNode-&gt;setAttribute('name', $name);
        $this-&gt;contextNode()-&gt;appendChild($dirNode);

        return new Directory($dirNode);
    }

    public function addFile(string $name, string $href): File
    {
        $fileNode = $this-&gt;dom()-&gt;createElementNS(
            'https://schema.phpunit.de/coverage/1.0',
            'file'
        );

        $fileNode-&gt;setAttribute('name', $name);
        $fileNode-&gt;setAttribute('href', $href);
        $this-&gt;contextNode()-&gt;appendChild($fileNode);

        return new File($fileNode);
    }

    protected function setContextNode(DOMElement $context): void
    {
        $this-&gt;dom         = $context-&gt;ownerDocument;
        $this-&gt;contextNode = $context;
    }

    protected function contextNode(): DOMElement
    {
        return $this-&gt;contextNode;
    }
}
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