newsupernova/vendor/magento/module-store/etc/config.xsd

<?xml version="1.0" encoding="UTF-8"?>
<!--
/**
 * This schema must be used to validate config.xml files
 *
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="config" type="configType" />
    <xs:complexType name="configType" mixed="true">
        <xs:choice maxOccurs="unbounded" minOccurs="0">
            <xs:element name="default"  type="mixedDataType" />
            <xs:element name="stores"   type="mixedDataType" />
            <xs:element name="websites" type="mixedDataType" />
        </xs:choice>
    </xs:complexType>
    <xs:complexType name="mixedDataType">
        <xs:choice>
            <xs:any processContents="lax" minOccurs="0" maxOccurs="unbounded" />
        </xs:choice>
    </xs:complexType>
</xs:schema>