SchemaLocator.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Framework\Mview\Config;

class SchemaLocator implements \Magento\Framework\Config\SchemaLocatorInterface
{
    /**
     * Path to corresponding XSD file with validation rules for merged config
     *
     * @var string
     */
    protected $_schema = null;

    /**
     * Path to corresponding XSD file with validation rules for separate config files
     *
     * @var string
     */
    protected $_perFileSchema = null;

    /**
     * @param \Magento\Framework\Config\Dom\UrnResolver $urnResolver
     */
    public function __construct(\Magento\Framework\Config\Dom\UrnResolver $urnResolver)
    {
        $this->_schema = $urnResolver->getRealPath('urn:magento:framework:Mview/etc/mview.xsd');
        $this->_perFileSchema = $this->_schema;
    }

    /**
     * Get path to merged config schema
     *
     * @return string|null
     */
    public function getSchema()
    {
        return $this->_schema;
    }

    /**
     * Get path to pre file validation schema
     *
     * @return string|null
     */
    public function getPerFileSchema()
    {
        return $this->_perFileSchema;
    }
}