Config.php

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<?php
namespace Magento\Framework\App\Language;

use Magento\Framework\Config\Dom;

class Config
{
    protected $urnResolver;

    protected $domFactory;

    protected $_data;

    public function __construct(
        $source,
        \Magento\Framework\Config\Dom\UrnResolver $urnResolver,
        \Magento\Framework\Config\DomFactory $domFactory
    ) {
        $this->urnResolver = $urnResolver;
        $this->domFactory = $domFactory;
        $dom = $this->domFactory->createDom(['xml' => $source, 'schemaFile' => $this->getSchemaFile()]);
        $this->_data = $this->_extractData($dom->getDom());
    }

    protected function getSchemaFile()
    {
        return $this->urnResolver->getRealPath('urn:magento:framework:App/Language/package.xsd');
    }

    protected function _extractData(\DOMDocument $dom)
    {
        $languageNode = $dom->getElementsByTagName('language')->item(0);
        $codeNode = $languageNode->getElementsByTagName('code')->item(0);
        $vendorNode = $languageNode->getElementsByTagName('vendor')->item(0);
        $packageNode = $languageNode->getElementsByTagName('package')->item(0);
        $sortOrderNode = $languageNode->getElementsByTagName('sort_order')->item(0);
        $use = [];
        foreach ($languageNode->getElementsByTagName('use') as $useNode) {
            $use[] = [
                'vendor'  => $useNode->getAttribute('vendor'),
                'package' => $useNode->getAttribute('package'),
            ];
        }
        return [
            'code'       => $codeNode->nodeValue,
            'vendor'     => $vendorNode->nodeValue,
            'package'    => $packageNode->nodeValue,
            'sort_order' => $sortOrderNode ? $sortOrderNode->nodeValue : 0,
            'use'        => $use
        ];
    }

    public function getCode()
    {
        return $this->_data['code'];
    }

    public function getVendor()
    {
        return $this->_data['vendor'];
    }

    public function getPackage()
    {
        return $this->_data['package'];
    }

    public function getSortOrder()
    {
        return $this->_data['sort_order'];
    }

    public function getUses()
    {
        return $this->_data['use'];
    }
}