ITSSTOOLS/datamodels/2.x/sample-portal-alter-twig/datamodel.sample-portal-alter-twig.xml

<?xml version="1.0" encoding="UTF-8"?>
<itop_design xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.3">
	<module_designs>
		<module_design id="itop-portal" xsi:type="portal">
			<properties>
				<themes>
                    <theme id="custom" _delta="define_if_not_exists">../sample-portal-alter-twig/custom.css</theme>
                </themes>
				<templates>
                    <template id="layout" _delta="define_if_not_exists">./sample-portal-alter-twig/layout.html.twig</template>
                </templates>
			</properties>
		</module_design>
	</module_designs>
</itop_design>