Converter.php

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<?php
namespace Magento\Framework\App\Config\Initial;

class Converter implements \Magento\Framework\Config\ConverterInterface
{
    protected $_nodeMap = [];

    protected $_metadata = [];

    public function __construct(array $nodeMap = [])
    {
        $this->_nodeMap = $nodeMap;
    }

    public function convert($source)
    {
        $output = [];
        $xpath = new \DOMXPath($source);
        $this->_metadata = [];

        foreach ($xpath->query(implode(' | ', $this->_nodeMap)) as $node) {
            $output = array_merge($output, $this->_convertNode($node));
        }
        return ['data' => $output, 'metadata' => $this->_metadata];
    }

    protected function _convertNode(\DOMNode $node, $path = '')
    {
        $output = [];
        if ($node->nodeType == XML_ELEMENT_NODE) {
            if ($node->hasAttributes()) {
                $backendModel = $node->attributes->getNamedItem('backend_model');
                if ($backendModel) {
                    $this->_metadata[$path] = ['backendModel' => $backendModel->nodeValue];
                }
            }
            $nodeData = [];
            foreach ($node->childNodes as $childNode) {
                $childrenData = $this->_convertNode($childNode, ($path ? $path . '/' : '') . $childNode->nodeName);
                if ($childrenData == null) {
                    continue;
                }
                if (is_array($childrenData)) {
                    $nodeData = array_merge($nodeData, $childrenData);
                } else {
                    $nodeData = $childrenData;
                }
            }
            if (is_array($nodeData) && empty($nodeData)) {
                $nodeData = null;
            }
            $output[$node->nodeName] = $nodeData;
        } elseif ($node->nodeType == XML_CDATA_SECTION_NODE || $node->nodeType == XML_TEXT_NODE && trim(
            $node->nodeValue
        ) != ''
        ) {
            return $node->nodeValue;
        }

        return $output;
    }
}