DefaultBackend.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Eav\Model\Entity\Attribute\Backend;

/**
 * Entity/Attribute/Model - attribute backend default
 *
 * @api
 * @since 100.0.2
 */
class DefaultBackend extends \Magento\Eav\Model\Entity\Attribute\Backend\AbstractBackend
{
}