newsupernova/vendor/magento/module-email/Model/Template/Config/Converter.php

<?php
/**
 * Converter of email templates configuration from \DOMDocument to array
 *
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Email\Model\Template\Config;

class Converter implements \Magento\Framework\Config\ConverterInterface
{
    /**
     * {@inheritdoc}
     */
    public function convert($source)
    {
        $result = [];
        /** @var \DOMNode $templateNode */
        foreach ($source->documentElement->childNodes as $templateNode) {
            if ($templateNode->nodeType != XML_ELEMENT_NODE) {
                continue;
            }
            $templateId = $templateNode->attributes->getNamedItem('id')->nodeValue;
            $templateLabel = $templateNode->attributes->getNamedItem('label')->nodeValue;
            $templateFile = $templateNode->attributes->getNamedItem('file')->nodeValue;
            $templateType = $templateNode->attributes->getNamedItem('type')->nodeValue;
            $templateModule = $templateNode->attributes->getNamedItem('module')->nodeValue;
            $templateArea = $templateNode->attributes->getNamedItem('area')->nodeValue;

            $result[$templateId] = [
                'label' => $templateLabel,
                'file' => $templateFile,
                'type' => $templateType,
                'module' => $templateModule,
                'area' => $templateArea,
            ];
        }
        return $result;
    }
}