magento-test/app/code/Magento/Ui/etc/ui_template.xsd

<?xml version="1.0" encoding="UTF-8"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
    <xs:element name="form">
        <xs:complexType >
            <xs:sequence>
                <xs:any minOccurs="0" maxOccurs="unbounded" processContents="lax" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:element name="div" >
        <xs:complexType >
            <xs:sequence>
                <xs:any minOccurs="0" maxOccurs="unbounded" processContents="lax" />
            </xs:sequence>
            <xs:anyAttribute processContents="lax" />
        </xs:complexType>
    </xs:element>
</xs:schema>