grarchetype-common/src/test/archetypes/nested-innest/META-INF/maven/archetype-metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
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<archetype-descriptor name="nested-innest" partial="false" >

    <requiredProperties>
        <requiredProperty key="XXX">
            <defaultValue>default-value</defaultValue>
        </requiredProperty>
        <requiredProperty key="XXX"/>
    </requiredProperties>

    <fileSets/>

    <modules>
        <module artifactId="${rootArtifactId}-inner">
            <modules>
                <module artifactId="${rootArtifactId}-innest" />
            </modules>
        </module>
    </modules>

</archetype-descriptor>