model.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<featureModel>
	<properties>
		<graphics key="showhiddenfeatures" value="true"/>
		<graphics key="legendautolayout" value="true"/>
		<graphics key="showshortnames" value="false"/>
		<graphics key="layout" value="horizontal"/>
		<graphics key="showcollapsedconstraints" value="true"/>
		<graphics key="legendhidden" value="false"/>
		<graphics key="layoutalgorithm" value="1"/>
	</properties>
	<struct>
		<and abstract="true" mandatory="true" name="Graph product line">
			<and mandatory="true" name="Graph type">
				<alt abstract="true" mandatory="true" name="Type 1">
					<feature name="Directed"/>
					<feature name="Undirected"/>
				</alt>
				<alt abstract="true" mandatory="true" name="Type 2">
					<feature name="Weighted"/>
					<feature name="Unweighted"/>
				</alt>
			</and>
			<alt name="Search">
				<feature name="DFS"/>
				<feature name="BFS"/>
			</alt>
		</and>
	</struct>
</featureModel>