Reader.php

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<?php
namespace Magento\Widget\Model\Config;

class Reader extends \Magento\Framework\Config\Reader\Filesystem
{
    protected $_idAttributes = [
        '/widgets/widget' => 'id',
        '/widgets/widget/parameters/parameter' => 'name',
        '/widgets/widget/parameters/parameter/options/option' => 'name',
        '/widgets/widget/containers/container' => 'name',
        '/widgets/widget/containers/container/template' => 'name',
    ];

    public function __construct(
        \Magento\Framework\Config\FileResolverInterface $fileResolver,
        Converter $converter,
        \Magento\Framework\Config\SchemaLocatorInterface $schemaLocator,
        \Magento\Framework\Config\ValidationStateInterface $validationState,
        $fileName = 'widget.xml',
        $idAttributes = [],
        $domDocumentClass = \Magento\Framework\Config\Dom::class,
        $defaultScope = 'global'
    ) {
        parent::__construct(
            $fileResolver,
            $converter,
            $schemaLocator,
            $validationState,
            $fileName,
            $idAttributes,
            $domDocumentClass,
            $defaultScope
        );
    }

    public function readFile($file)
    {
        return $this->_readFiles([$file]);
    }
}