Config.php

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<?php
namespace Magento\Framework\Simplexml;

class Config
{
    protected $_xml = null;

    protected $_elementClass = \Magento\Framework\Simplexml\Element::class;

    protected $_xpathExtends = "//*[@extends]";

    public function __construct($sourceData = null)
    {
        if ($sourceData === null) {
            return;
        }
        if ($sourceData instanceof Element) {
            $this->setXml($sourceData);
        } elseif (is_string($sourceData) && !empty($sourceData)) {
            if (strlen($sourceData) < 1000 && is_readable($sourceData)) {
                $this->loadFile($sourceData);
            } else {
                $this->loadString($sourceData);
            }
        }
    }

    public function setXml(Element $node)
    {
        $this->_xml = $node;
        return $this;
    }

    public function getNode($path = null)
    {
        if (!$this->getXml() instanceof Element) {
            return false;
        } elseif ($path === null) {
            return $this->getXml();
        } else {
            return $this->getXml()->descend($path);
        }
    }

    public function getXpath($xpath)
    {
        $xml = $this->getXml();
        if (empty($xml)) {
            return false;
        }

        if (!($result = @$xml->xpath($xpath))) {
            return false;
        }

        return $result;
    }

    public function getXmlString()
    {
        return $this->getNode()->asNiceXml('', false);
    }

    public function loadFile($filePath)
    {
        if (!is_readable($filePath)) {
            //throw new \Exception('Can not read xml file '.$filePath);
            return false;
        }

        $fileData = file_get_contents($filePath);
        $fileData = $this->processFileData($fileData);
        return $this->loadString($fileData);
    }

    public function loadString($string)
    {
        if (!empty($string)) {
            $xml = simplexml_load_string($string, $this->_elementClass);
            if ($xml) {
                $this->setXml($xml);
                return true;
            }
        }
        return false;
    }

    public function loadDom(\DOMNode $dom)
    {
        $xml = simplexml_import_dom($dom, $this->_elementClass);
        if ($xml) {
            $this->setXml($xml);
            return true;
        }

        return false;
    }

    public function setNode($path, $value, $overwrite = true)
    {
        $this->getXml()->setNode($path, $value, $overwrite);
        return $this;
    }

    public function applyExtends()
    {
        $targets = $this->getXpath($this->_xpathExtends);
        if (!$targets) {
            return $this;
        }
        foreach ($targets as $target) {
            $sources = $this->getXpath((string)$target['extends']);
            if ($sources) {
                foreach ($sources as $source) {
                    $target->extend($source);
                }
            }
        }
        return $this;
    }

    public function processFileData($text)
    {
        return $text;
    }

    public function extend(Config $config, $overwrite = true)
    {
        $this->getNode()->extend($config->getNode(), $overwrite);
        return $this;
    }

    public function __destruct()
    {
        $this->_xml = null;
    }

    protected function getXml()
    {
        return $this->_xml;
    }
}